NOVA 8200 Infinity Retro Fit Kit for Chuck Accessories Fits ALL existing NOVA Chuck Accessory Jaws to adapt to Infinity Quick Change System Adapt your existing Nova Jaw Accessories to fit the new Nova Infinity Quick Change System. Complete jaw change outs in under 30 seconds Retro fit keys provide a very strong, durable and accurate jaw mounting to Infinity Chuck Slides Retro fit keys use a charlock system which is self tightening with increased speed in forward spindle direction Retro Fit Keys are easy to mount by using the two screws positions on existing jaws. It is recommended that a new set of jaw screws is used