Retaining RingThese screwdriver bits have a collar that acts as a stopper, preventing the bit from following the screw head into the drywall. The depth stop design can limit the screw penetration and damage the panel, once the collar comes into contact with the plasterboard, the drill bit cannot move forward. PH2 screwdriver Made of high strength S2 alloy steel, these screwdriver bits are very durable. Heat treated to resist breaking and wear, impact resistant tool steel for maximum durability with a 1/4" hex shank for use in bit holders. Head MagneticThese screwdriver bits are with magnetic head, so they can firmly fix on the screw.Strong magnetic, can easily suck the screws when used.Bright color of the retaining ring allows you to observe clearly and easily, which is useful for your work. Widely UsedThese screwdriver bits have a wide range of applications, with 1/4 inch hex shank, designed to fit any n any electric drill and cordless drill for normal use. ServiceIf you have any questions about our products, please feel free to contact us.We will get back to you within 24 hours.Help&gt ;>>Need further assistance>>>Contact us at the top of Product Description Features: Made of steel High-strength S2 ally, these screwdriver bits are very durable. The screwdriver bits feature strong magnetism and 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 little can't go any further. With the 1/4inch hex shank, they are widely used on many drill bits or cordless drills. Using these screwdriver bits , the drywall screw head will stretch and gouge the drywall skin, but not rupture it. Features: 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