The standard slotted head is most effective utilised having a flat screwdriver, when the cross-shaped indention is very best suited to the Phillips screwdriver. A Robertson screw provides a square-formed indention and needs a matching driver head. The duration of these screws varies, but most drywall screws have flat heads https://woodscrews19741.isblog.net/the-2-minute-rule-for-screws-45753480