ITEM NAME:10x25mm PH2 Dimpler Drilling Bits For Drywall Plasterboard Vanadium Screws IO BX Description 100% New and High Quality!!! Colour: as shown in the picture Material: Shock-resistant tool steel Size: 25mm Features: PH2 bits for drywall screws Automatically sets screws to proper depth in drywall Shock-resistant tool steel Heat-treated to resist breakage These are designed to be used with any power drill or cordless drill Includes depth stop to limit screw penetration & damage to board Installs drywall screws easily.PH2 bits for drywall screws. Automatically sets screws to proper depth in drywall. Installs drywall screws easily. These are designed to be used with any power drill or cordless drill. Heat-treated to resist breakage.