The typical slotted head is best employed that has a flat screwdriver, though the cross-shaped indention is greatest suited to the Phillips screwdriver. A Robertson screw features a square-formed indention and demands a matching driver head. This bolt, along with the equipment screw that goes with it, sits on a https://manuelwwxwt.dbblog.net/1772683/5-simple-statements-about-screws-explained