Also called a pozisquare screw head, the quadrex square head brings together the Robertson plus the Phillips screw head. It can be even known as the Phillips square screw head. The angle formed involving the helical thread Together with the perpendicular axis with the lead screw shaft is called the https://brooksopnlh.blogunteer.com/28756697/a-secret-weapon-for-types-of-screw-heads-for-screwdrivers