The standard slotted head is greatest applied with a flat screwdriver, whilst the cross-shaped indention is finest suited to the Phillips screwdriver. A Robertson screw features a square-shaped indention and needs a matching driver head. Elevator bolts are Employed in an array of purposes. These bolts can, by way of https://caidenjljhf.blogars.com/28080985/the-ultimate-guide-to-wood-screws