The common slotted head is finest made use of with a flat screwdriver, whilst the cross-shaped indention is greatest suited into a Phillips screwdriver. A Robertson screw provides a sq.-formed indention and demands a matching driver head. This bolt, together with the machine screw that goes with it, sits on https://andydffda.angelinsblog.com/28058284/5-simple-statements-about-screws-explained