XIANQI 【PH2 Screwdriver】These Drywall Screwdriver Bits are made of high-strength S2 alloy steel, these screwdriver bits are very durable. Heat treated to resist breakage and wear, impact resistant tool steel for maximum durability with a 1/4 "hex shank for use in bit holders. 【Protect the surface】Depth stop design can limit screw penetration and damage to the board, easier to install drywall screws. Using these screwdriver bits, the head of the drywall screw will stretch and dimple the surface of the drywall, but will not break it. 【Magnetic head】These drywall bit holders are magnetic head, so they can be firmly fixed on the screw. Strong magnetic, it can easily suck the screws when using. 【Retaining Ring】The ph2 screwdriver bits have a collar that acts as a stopper, preventing the bit from following the screw head into the drywall - once the collar comes into contact with the masonry sheathing, the bit cannot continue. 【Adaptation Tools】The magnetic cross screw holders are equipped with 1/4 in. Hex shank. They are designed to fit any power drill and cordless drill for normal use. Features: Made of high-strength S2 alloy steel, these screwdriver bits are very durable. Screwdriver bits has strong magnetism and would attract screws and hold screws firmly. These screwdriver bits have a collar that acts as a stop, preventing the bit from following the screw head into the drywall--once the collar contacts the drywall skin, the bit cannot proceed any further. With 1/4inch hex shank, they are widely used on many power drills or cordless drills. Using these screwdriver bits, drywall screw head will stretch and dimple the drywall skin, but not ruptured it. Specifications: Color: Red Material: S2 steel Type: PH2(Cross) Magnetism: Yes Length: 65mm(2.56") Hex Shank: 6.35mm(1/4") Quantity: 5pcs Package Includes: 5 x Screwdriver Bits