▲Triangle Screwdriver Bit Set, Crafted with Heat-treated S2 alloy steel bits for increased torque and unmatched hardness. ▲Strong magnetic, high precision. each edge can be accurately locked screws, no damage to the screw and the screwdriver head. ▲Sizes:1.8mm, 2mm, 2.3mm, 2.7mm, 3mm (2 of Each Size) ▲Fit for hand screwdrivers, electric screwdrivers, any 1/4 inch hex shank power drill. Triangle Screwdriver Bit Set Sizes:1.8mm, 2mm, 2.3mm, 2.7mm, 3mm (2 of Each Size)