Triangle Screwdriver Bits Set, made of S2 alloy steel, durable and great wear resistant. Triangle Head Size: 1.8, 2.0, 2.3, 2.7, 3.0 Shank: 6.35mm(1 or 4 inch) Overall Length: 50mm(2 inch) Magnetic triangular screwdriver bits, easy to suck the screws when using, no damage to the screw and the screwdriver head. Suitable for installation in pneumatic screwdrivers, electric screwdriver, rechargeable drill, using the wind batch. Ideal screwdriver accessory tool for repairing household appliances, precision instruments, furniture installing Package Included 5 x Triangle Head Screwdriver Bits Specification color: as show Material: S2 Alloy Steel Type of Shank: 1 or 4 inch or 6.35mm hex Overall Length: 2 Inch or 50mm Triangle Head Size: 1.8 - - - - - Triangle's height: 1.8mm 2.0 - - - - - Triangle's height: 2.0mm 2.3 - - - - - Triangle's height: 2.3mm 2.7 - - - - - Triangle's height: 2.7mm 3.0 - - - - - Triangle's height: 3.0mm