The common slotted head is best used with a flat screwdriver, whilst the cross-shaped indention is finest suited to a Phillips screwdriver. A Robertson screw contains a square-shaped indention and needs a matching driver head. This bolt, combined with the machine screw that goes with it, sits on just one https://timco-screws75307.qowap.com/87987095/top-guidelines-of-wood-screws