Torx: Also referred to as “star” heads, Torx screws have an internal star form that requires using a matching Torx driver or generate little bit. A Twin Screw is one which has two spirals of threads operating up the screw. They are sometimes called Double Start out Screws because the https://andersonsemuz.p2blogs.com/28784946/facts-about-types-of-screw-heads-shapes-revealed