PH2 Hex Shank Anti-Slip Magnetic Depth Stop prevents screw from over-penetrating and does not damage the wood board or sheet metal 1/4 S2 chrome steel drywall could hold the screw firmly, it is anti-slip when screwing, can suck the screws easily when used. PH2 Hex Shank Magnetic offers screw gun function in electric drill, shockproof.quick to connect. Can work well with electric screwdriver. PH2 Screwdriver Bits Made of high strength S2 alloy steel,high strength,hardness.Good corrosion resistance and abrasion resistance,long service life. PH2 Hex Shank Magnetic for installing drywall screws and drywall screws,use in bit holders. Magnetic Drywall Screwdriver Bit Well made and reliable quality,High precision, High efficiency,save your time.Automatically set screws to the proper depth in drywall. Drywall Screwdriver Bits Includes a depth stop to limit screw penetration and damage to the board. 1/4 S2 chrome steel drywall to absorb screws and reduce screw abrasion, Magnetic Screwdriver