【Strong Magnetic Bit Set】Strengthened magnetic impact bits helps you easy pick up screws. The magnetism doesn’t decay after multiple uses, no damage to the screw and screwdriver head. 【S2 Alloy Steel】S2 alloy steel body, hardened core to increase bit strength and reduce fracture. Special coating to protect the surface, rust-proof ability. 【Durable Materials】Each hex head allen wrench drill bit has a specially designed torque zone that absorbs torque spikes, greatly reducing the risk of breakage during high-intensity screw driving tasks. 【Size】This 10-piece allen wrench drill bit set includes H1.5, H2, H2.5, H3, H3.5, H4, H5, H6, H7 ,H8 and 1 pcs 60 mm Length quick change extension drill bit holder for precisely setting drywall screws without cracking the board. 【Wide Used】This magnetic allen wrench drill bit not only can you use the bits on hand tools, you can easily insert them to any 1/4 inch hex shank power drill to use. Each hex bit has a specially designed torque zone that absorbs torque spikes, greatly reducing the risk of breakage during high-intensity screw driving tasks.