Record Power VersaLock Dome Zero Jaw Insert is specifically designed to hold the smallest, most fragile workpieces, allowing you to get very close to support thin work as safely as possible. They also allow good access to work close to the base of a workpiece without the tool fouling on the jaws. For maximum support, always ensure the workpiece features a spigot long enough to be supported along the full length of the jaws' internal surfaces. Fits quickly and securely into the VersaLock 51 mm (2") base jaw — just slide and secure.