Piranha Gripper 40mm Jaws Axminster 

A very versatile 114mm jaw set designed for the Evolution chucks but also suitable for use with the SK100.The Piranha jaws expand into a 82mm dovetailed recess and have a series of teeth for an internal grip onto a 62mm spigot diameter. These given dimensions are when the jaws form a true circle and offer the best grip. Recommended range: 62-80mm internal, 85-102mm external. An excellent choice for hollow forms or turning unseasoned timber, these jaws also allow good access to the rear of your projects while still mounted on the lathe