4" (100MM) Diameter * This chuck is made from steel with a chrome plated body and black anodized jaws. The basic chuck includes Standard Dovetail Jaws, Screw, 6" Long Chuck Key, Allen Key for removing the chuck jaws and your choice of one threaded insert. * includes Standard Dovetail Jaws, Screw, 6" Long Chuck Key, Allen Key for removing the chuck jaws and your choice of one threaded insert. * The backplate is indexed in 24 positions. * A great chuck for Full Size / Midi and Mini Lathes.