The standard slotted head is best used having a flat screwdriver, whilst the cross-shaped indention is very best suited to some Phillips screwdriver. A Robertson screw features a square-shaped indention and demands a matching driver head. The length of these screws may differ, but most drywall screws have flat heads https://augustlmljg.thechapblog.com/28099888/the-ultimate-guide-to-wood-screws