The Hex opening has flat edges to provide full contact with flanged hex head screws, and the lobular design in the hex drive is engineered to reduce stripping damage by driving fasteners on the sides, not the corners. With a fixed magnet insert which allows for easy one-handed operation. Features Matte Nickel Coated Chromium-Vanadium Alloy Steel for great oxidation, corrosion, and abrasion resistance. Calibrated heat treated for added durability. Lobular hex design for greater contact with fastener. Rare Earth Magnet for increased holding power.