The regular slotted head is ideal applied which has a flat screwdriver, while the cross-shaped indention is best suited to a Phillips screwdriver. A Robertson screw includes a sq.-formed indention and demands a matching driver head. The size of these screws may differ, but most drywall screws have flat heads https://franciscoyywvs.humor-blog.com/27803682/getting-my-wood-screws-to-work