The regular slotted head is very best utilized having a flat screwdriver, whilst the cross-shaped indention is best suited to a Phillips screwdriver. A Robertson screw has a sq.-formed indention and needs a matching driver head. The length of those screws may differ, but most drywall screws have flat heads https://wood-screws53185.blogminds.com/top-guidelines-of-wood-screws-26302645