100 percent New and High Quality. It made of high-strength S2 alloy steel, very durable. Toughness is good, hard to rupture and wearproof. Magnetic bits, in the installation can easily absorb screws Suitable for installation in pneumatic screwdrivers, electric screwdriver, rechargeable drill, using the wind batch. Widely used power tools, electric screwdriver assembly, electronics industry, household appliances, precision instruments industry, furniture industry screw equipment. Material: S2 Steel Hex Shank Size: 6.35mm (1 or 4") Bits specification: 18 20 23 27 30 18 mean triangles height is 1.8mm 20 mean triangles height is 2.0mm 23 mean triangles height is 2.3mm 27 mean triangles height is 2.7mm 30 mean triangles height is 3.0mm Total Length: 50mm Package included: 1 x 1.8mm Screwdriver Bit 1 x 2.0mm Screwdriver Bit 1 x 2.3mm Screwdriver Bit 1 x 2.7mm Screwdriver Bit 1 x 3.0mm Screwdriver Bit