Hardwood screws commonly have tighter threads than softwoods, meaning additional threads for every inch. This allows avert splitting when setting up into hardwoods. 2. Device Screws‍ The Robertson head, AKA the square head, dates again to 1907. Typical in copyright and extended thought to be a curiosity while in the https://codyddbpn.blogtov.com/9832938/detailed-notes-on-types-of-screw-heads