The typical slotted head is very best applied having a flat screwdriver, while the cross-formed indention is ideal suited to some Phillips screwdriver. A Robertson screw provides a square-shaped indention and demands a matching driver head. This bolt, along with the machine screw that goes with it, sits on 1 https://timco-screws75207.develop-blog.com/34840266/wood-screws-fundamentals-explained