5.8mm Jobber Drill Bit - Cobalt Series
Alpha Cobalt HSS Jobber Drill Bit is Alpha's drill bit for Stainless steel high tensile and cast iron. The cobalt increases the strength of the steel and makes it more heat-resistant; this is an important factor in drilling hard materials because the friction of metal against metal can produce high temperatures that damage the material or the drill bit Features / Benefits: Ideal for heavy duty drilling. 135° split point cuts faster and reduces wandering. Fully ground HSS Cobalt increases strength and drill life. Cobalt drill bits are often more expensive than other drill bits but if you regularly drill through metal they are a good investment since they tend to last longer. You can buy sets of drill bits in graduated sizes or individual drill bits for your specific needs. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person and Bolt and Nut Australia is not responsible for any loss claim or damages arising therefrom.
Alpha Cobalt HSS Jobber Drill Bit is Alpha's drill bit for Stainless steel high tensile and cast iron. The cobalt increases the strength of the steel and makes it more heat-resistant; this is an important factor in drilling hard materials because the friction of metal against metal can produce high temperatures that damage the material or the drill bit Features / Benefits: Ideal for heavy duty drilling. 135° split point cuts faster and reduces wandering. Fully ground HSS Cobalt increases strength and drill life. Cobalt drill bits are often more expensive than other drill bits but if you regularly drill through metal they are a good investment since they tend to last longer. You can buy sets of drill bits in graduated sizes or individual drill bits for your specific needs. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person and Bolt and Nut Australia is not responsible for any loss claim or damages arising therefrom.
Alpha Cobalt HSS Jobber Drill Bit is Alpha's drill bit for Stainless steel high tensile and cast iron. The cobalt increases the strength of the steel and makes it more heat-resistant; this is an important factor in drilling hard materials because the friction of metal against metal can produce high temperatures that damage the material or the drill bit Features / Benefits: Ideal for heavy duty drilling. 135° split point cuts faster and reduces wandering. Fully ground HSS Cobalt increases strength and drill life. Cobalt drill bits are often more expensive than other drill bits but if you regularly drill through metal they are a good investment since they tend to last longer. You can buy sets of drill bits in graduated sizes or individual drill bits for your specific needs. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person and Bolt and Nut Australia is not responsible for any loss claim or damages arising therefrom.
Alpha Cobalt HSS Jobber Drill Bit is Alpha's drill bit for Stainless steel high tensile and cast iron. The cobalt increases the strength of the steel and makes it more heat-resistant; this is an important factor in drilling hard materials because the friction of metal against metal can produce high temperatures that damage the material or the drill bit Features / Benefits: Ideal for heavy duty drilling. 135° split point cuts faster and reduces wandering. Fully ground HSS Cobalt increases strength and drill life. Cobalt drill bits are often more expensive than other drill bits but if you regularly drill through metal they are a good investment since they tend to last longer. You can buy sets of drill bits in graduated sizes or individual drill bits for your specific needs. All material is advisory only and its use by anyone is entirely voluntary. Reliance on it for any purpose by anyone is at the sole risk of that person and Bolt and Nut Australia is not responsible for any loss claim or damages arising therefrom.
in 5 offers
The lowest price for 5.8mm Jobber Drill Bit - Cobalt Series right now is $15.73 at Southland Supply Group, compared across 4 retailers.
The all-time low was $10.01 on 27 Dec 2025 — today's price is 57% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 13 May 2026.
Last updated at 13/05/2026 23:45:27
5.8mm Cobalt Jobber Drill Bit
Delivery $22
5.8mm X 93mm Jobber Hss Cobalt Drill Bit High Tensile Stainless Steel
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Qty 1 Metric Cobalt Jobber Drill Bit 5.8mm X 93mm Hss Alpha 9lm058co
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
5.8mm x 93mm Cobalt HSS Jobber Drill Bit Alpha 9LM058CO
Free delivery between Fri – Tue
Alpha - 5.8mm Jobber Drill Bit - Cobalt Series Carded | 9LM058CO
Delivery between 14–22 May $7.95
originally posted on swartstools.com.au/
"Swarts has always been a great product as far as I'm concerned and this one is no exception. The bits are super sharp and as durable as any I have had so far. Love this purchase!"
originally posted on swartstools.com.au/
"These work well. In wood, aluminium and plastic you can run these at high speed. But on steel you need to use a very low speed. The steel should peel up in short strips. Otherwise the leading edge will heat and then blunt."
originally posted on swartstools.com.au/
"Good quality drill bits, handy for any occasion. Cobalt can be brittle, but with care it did the job nicely for me and I used a drilling and cutting oil."
| Size | M5.8 (5.8mm) |
| Product Brand | Alpha |
| System of Measurement | Metric |
| Brand | Alpha |
| Length (L) | 93mm |
5.8mm Cobalt Jobber Drill Bit
Delivery $22
5.8mm X 93mm Jobber Hss Cobalt Drill Bit High Tensile Stainless Steel
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Qty 1 Metric Cobalt Jobber Drill Bit 5.8mm X 93mm Hss Alpha 9lm058co
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
5.8mm x 93mm Cobalt HSS Jobber Drill Bit Alpha 9LM058CO
Free delivery between Fri – Tue
Alpha - 5.8mm Jobber Drill Bit - Cobalt Series Carded | 9LM058CO
Delivery between 14–22 May $7.95
"Swarts has always been a great product as far as I'm concerned and this one is no exception. The bits are super sharp and as durable as any I have had so far. Love this purchase!"
"These work well. In wood, aluminium and plastic you can run these at high speed. But on steel you need to use a very low speed. The steel should peel up in short strips. Otherwise the leading edge will heat and then blunt."
"Good quality drill bits, handy for any occasion. Cobalt can be brittle, but with care it did the job nicely for me and I used a drilling and cutting oil."
"These drill bits are tough and the case is nice. I highly recommend these. I use them almost every weekend on metal projects and they barely even look worn."
"drill bits are good and sharp, and they are good quality as well! They have already saved my butt a couple of times, ultimately making for a good day when leaving the shop!"
"This is a very nice cobalt drill bits. Even though these are "High-speed" drill bits, that doesn't mean you go full throttle when drilling holes. Take your time, slow down the RPMs, use a little bit of cutting oil and these babies will cut through anything and you'll still have a nice, sharp bit when you're done. Very impressed with this bit and I would buy again."
Your service and in particular, the delivery was up there with the fastest I have experienced. Bought at same time as other items.
Brilliant drill bits for harder steel, in my case it’s stainless steel. Excellent product at reasonable price and quick delivery.
The Gold Bit was a little hard to drill low Gauge steel BUT the Cobalt Drill Bit made light work of drilling this low gauge steel
Did not drill high tensile steel.... Had to sharpen a tungsten tip drill to do the job.
| Size | M5.8 (5.8mm) |
| Product Brand | Alpha |
| System of Measurement | Metric |
| Brand | Alpha |
| Length (L) | 93mm |
