TITANIUM | HIGH-SPEED STEEL: Classic High-Speed Steel Construction With Titanium Coating For Proven Capability And Durability STRENGTH & DURABILITY: Made With HSS 4241, Rockwall Hardness Level HRC60-62 METAL STORAGE BOX: Set Includes a Drill Bit Storage Case With Size Index For Easy Storage And Organizing PROFESSIONALS & DIY USE: For Use On Metal, Wood & Plastics (Not For Use On Concrete / Masonry) A PERFECT MATCH FOR: Workshop or Service Vehicles This is 99pcs 1.5mm-10mm titanium coated HSS twist drill bits set kit with a iron case box. Great for drilling iron, alloy steel, non-alloy steel, copper, bronze, cast iron, hard plastics and perspex. Features: High speed steel twist drill bit set for wood, plastic, aluminum, copper and steel. Perfect for DIY, home use and general building / engineering using. Twist drills will make drilling easier and more effortless. Fast and clean drilling with maximum surface quality. Provide safe drilling start without pre-punching. Specifications: Color: Black Material: High Speed Steel Surface: Titanium Coated Hardness: HRC 60-62 Containing Sizes: 1.5mm, 2mm, 2.5mm, 3mm, 3.2mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 8mm, 10mm Quantity: 1 Set (99pcs) Size Quantity(pc) Length 1.5mm 16 40mm 2.0mm 16 46mm 2.5mm 15 57mm 3.0mm 10 60mm 3.2mm 10 64mm 3.5mm 8 69mm 4.0mm 8 74mm 4.5mm 3 79mm 5.0mm 3 85mm 5.5mm 2 89mm 6.0mm 2 92mm 6.5mm 2 99mm 8.0mm 2 116mm 10mm 2 134mm