Makita Impact Black bits are designed to withstand high torque when used with Impact Drivers. They are constructed from high strength, heat-treated S2 special steel. The black coating is to prevent rust. With precision-made tips to ensure a perfect hold. Up to 20% more durable than a standard bits. Kit Contents: 16x 25mm Screwdriver Bits, 6x 50mm Screwdriver Bits, 6x HSS Twist Drill Bits, 3x Magnetic Nut Setters, 60mm Magnetic Screwdriver Bit Holder & 80mm Magnetic Screw Guide Bit Holder. Product Contents: 25mm Screwdriver Bits: PH1, 3x PH2, PH3, PZ1, 3x PZ2, PZ3, T15, 2x T20, 2x T25, T30, 50mm Screwdriver Bits: PH2, PZ2, T15, T20, T25, T30, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm HSS Twist Drill Bits, 6mm, 8mm, 10mm Magnetic Nut Setters, 60mm Magnetic Screwdri.