Jaws are compatible with the chucks: Super NOVA2, G3 Nova, Robert Sorby Patriot, Record Power SC3, Record Power SC4.(All listed chucks require our NCK-JS8-M6 M6x12mm jaw fixing screws to be used) Gear chuck is one-handed operation to hold workpiece by single Gear Key, perfect for holding bowl, vase, spindle, and other unwieldy wood lathe projects. Widely used for machine tools and accessories for general lathes and industrial machines. The Self-Locking system delivers incredible gripping power after tightening, it will never loosen grip on project. The chuck includes Chuck body, Dovetail Jaws, Wood Screw, Two Nylon Washers, T Handle Allen Key. MAKE SURE check your wood lathe FIT first. 1"X8TPI Thread is compatibile with the majority of wood lathes on the market. Nylon Washers keep your chuck or faceplate from getting stuck, Make removing chucks and face plates much easier. NCK-G3.75 3.75" 4 Jaw Key Self-Centering Chuck, Thread 1"X8TPI, with NCK-3.75Z-DJDD Dovetail Jaws, Wood Screw, Two Nylon Washers, T Handle Allen Key