4Pcs/1Pc Magnetic Triangle Screwdriver Bits S2 Steel 1/4 Hex Shank Hex Shank: 1/4 "(6.35mm) Bits specification: 18; 20; 23; 27 S2 alloy steel hard, good workmanship, high precision Magnetic bits, in the installation can easily absorb screws Suitable for installation in pneumatic screwdrivers, electric screwdriver, rechargeable drill, using the wind batch