The conventional slotted head is very best utilised with a flat screwdriver, when the cross-formed indention is best suited to some Phillips screwdriver. A Robertson screw incorporates a sq.-formed indention and requires a matching driver head. The size of these screws may differ, but most drywall screws have flat heads https://judahnpmlj.loginblogin.com/35245530/little-known-facts-about-screws