The conventional slotted head is best used having a flat screwdriver, whilst the cross-shaped indention is most effective suited to your Phillips screwdriver. A Robertson screw includes a square-shaped indention and requires a matching driver head. Thread forming screws are similar to thread slicing screws, but as opposed to removing https://timcoscrews10098.blog2freedom.com/28384550/the-basic-principles-of-wood-screws