Description 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. very . Toughness is good, hard to rupture and wearproof. Material: S2 steel ColorSilver Hex Shank Size: Common 1/4 hexagonal shank (6.35mm) Bit Diameter: 1.8mm, 2.0mm, 2.3mm,2.5mm, 2.7mm, 3.0mm Total Length: 50mm Package Contents: 6 * batch head Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.