Sutton Heavy Duty Cobalt Jobber Drill Bit 5/16inch - D1080794Sutton Tools Heavy Duty Cobalt jobber drills are industrial quality for drilling materials that have high hardness and tensile strength such as cast iron, bronze, hardened steel & stainless steel. These drill bits feature a thick core for increased rigidity in hard materials.Features: 135 split point (drills > 2mm & 3/32) enables accurate positioning and less drilling pressure Thick core for increased rigidity in hard materials Precision engineered parallel shank for accurate hole size Made from HSS Co. The 5% cobalt formula improves abrasive & heat resistance, for increased strength at higher cutting temperatures Colour Tempered surface finish enables identification of cobalt tool material Sutton Tools was established in 1917 as a family business that produced threads and gauges. Over the years, the company has grown and now offers a wider range of cutting tools. Sutton Tools is still a family-owned firm in Australia today, and it is well known for its premium power tool accessories and cutting tools for the hardware industry as well as a variety of speciality industrial applications.