Designed for use with the 12-1/2" Variable-Speed Midi Lathe. Auto-stop jaw slides inhibit the jaws widening beyond their optimum clamping range, while threaded chuck jaws increase surface contact for further security. The anti-release spindle lock ensures the chuck stays securely mounted on the lathe during forward and reverse turning applications. The enhanced jaw gearing gives you extra smooth jaw movement and increased clamping pressure for maximum material support. Imported.