Anshun Tiger Grip® are invented to remove stubborn hex fasteners. Patented Anti-Slip design is perfect to remove or tighten up to 85% corner worn hex head. Yes, bi-directional anti-slip makes Anshun Tiger Grip® better than all other ant-slip sockets in the market. While working on non-worn hex fasteners, the flank design makes sure Anshun Tiger Grip® does not bite on the surface and leaves no markings. Go-through design also allows the socket to be built up to 50% shorter and with 20% less width which is an advantage in some situations. By using a fine tooth ratchet and socket system that allow a pass-through ratchet to be used as a conventional ratchet handle with interchangeable 14-inch and 11mm drives.