The typical slotted head is greatest applied having a flat screwdriver, although the cross-shaped indention is finest suited to the Phillips screwdriver. A Robertson screw provides a square-formed indention and requires a matching driver head. This bolt, together with the device screw that goes with it, sits on 1 facet https://timcoscrews65418.xzblogs.com/69926383/a-review-of-screws