The common slotted head is ideal utilised using a flat screwdriver, even though the cross-shaped indention is very best suited to some Phillips screwdriver. A Robertson screw includes a square-shaped indention and requires a matching driver head. The duration of these screws differs, but most drywall screws have flat heads https://screws43752.buyoutblog.com/28402310/the-2-minute-rule-for-screws