These extremely versatile jaws are a bigger version of the standard 50mm jaws and are particularly suitable for larger work, including hollow forms. The 70mm Jaw expands into a recess between 70mm and 90mm diameter. When gripping a spigot the range is 56mm to 77mm diameter. These jaws will also hold square stock between 37mm and 65mm. Suits both SuperNova2 and Nova G3 chucks.