types of screw heads Secrets
it is a variation get more info of the counter sunk screw head, though the below floor of The top is curved, like a bugle. This lowers damage to plasterboard minimizing tearing in the paper, so is usually discovered on drywall screws flat head screwhex head screwlag screwsPhillips screw headRobertson screw headself-tapping screwsTorx screw head F