The Robertson screwdriver, generally known as a sq. screwdriver, features a square-shaped tip. Invented by Peter Lymburner Robertson in copyright, this type of screwdriver is widely used in woodworking and construction tasks. It offers superb torque transfer and decreased cam-out, making it a popular choice among the Canadian DIYers and https://types-of-shingle81470.anchor-blog.com/9640186/the-greatest-guide-to-types-of-screw-heads-names