No doubt, Sunex tools offer one of the most complete and toughest Impact Socket lines around. This 1/4" drive 5/16" standard 6 point socket is designed to tackle the toughest jobs with solid durability and keeps them pounding job after job. Also it features a radius corner design, causing the socket to grab the sturdy wall of the fastener instead of grabbing the corners, resulting in less wear on the fastener.