The regular slotted head is most effective employed that has a flat screwdriver, whilst the cross-formed indention is best suited to your Phillips screwdriver. A Robertson screw has a sq.-formed indention and requires a matching driver head. Elevator bolts are used in a wide array of programs. These bolts can, https://woodscrews75207.blogsvila.com/28508416/the-definitive-guide-to-wood-screws