The regular slotted head is greatest employed by using a flat screwdriver, even though the cross-formed indention is ideal suited to your Phillips screwdriver. A Robertson screw provides a sq.-formed indention and needs a matching driver head. This bolt, together with the machine screw that goes with it, sits on https://timco-screws64185.alltdesign.com/the-greatest-guide-to-screws-48405955