There's two varieties of hex screws: An Allen screw provides a hexagonal indent in the head, necessitating an Allen wrench, and the opposite style has no indent inside the hexagonal head and need to be used or eliminated by using a socket wrench. Thread forming screws are comparable to thread https://screws01109.blogunok.com/28953050/how-screws-can-save-you-time-stress-and-money