The regular slotted head is best applied by using a flat screwdriver, whilst the cross-formed indention is ideal suited to some Phillips screwdriver. A Robertson screw has a sq.-shaped indention and demands a matching driver head. The duration of such screws may differ, but most drywall screws have flat heads https://dallasilihe.ka-blogs.com/81952770/the-definitive-guide-to-screws