Black & Gold Metal Drilling Set featuring Toughcore - tapered central core increases stability and durability and minimising breakage The Dewalt DT70755 Black & Gold Set offers 21 drills made from High-Speed Steel. The drill bits come in sizes: 1, 1.5, 2, 2.5, 3, 3.2, 3.3, 3.5, 4, 4.2, 4.5, 4.8, 5, 5.5, 6, 6.5, 7, 7.5, 8, 10 and 12mm. They are stored in a Connectable Tough Case compatible with the TSTAK System. Features: High-Speed Steel - wear resistance and longer life No Spin Shank - 3 flat sides eliminates slipping in the chuck Compatible with the TSTAK system via the Large Tough Case TSTAK compatible to hold all your accessory sets in one place Connectable Case allows multiple sets to be stacked and locked together Toughcore - tapered central core increases stability and durability, minimising breakage Speed Tip - fast start, precise centering and guidance. No walking including on curved surfaces Contains: 21x Gold HSS-G Metal Drill Bits: 1x 1.5mm 1x 2.5mm 1x 3.2mm 1x 3.3mm 1x 3.5mm 1x 4.2mm 1x 4.5mm 1x 4.8mm 1x 5.5mm 1x 6.5mm 1x 7.5mm 1x 10mm 1x 12mm 1x 1mm 1x 2mm 1x 3mm 1x 4mm 1x 5mm 1x 6mm 1x 7mm 1x 8mm