The big brother to the 100mm jaw set is designed to handle work up to 750mm in diameter. This jaw is suitable for the SuperNOVA2 chuck, but not recommended for use with the NOVA G3. The jaw expands into a recess between 127mm and 147mm diameter. When gripping a spigot, the range is 107mm to 128mm diameter. These jaws will also hold square stock between 77mm and 107mm. Suits only SuperNova2 chuck.