Heavy duty chrome-plated self-centering chuck will hold your work tight & secure on midi and full size woodworking lathes. Chuck is pre-threaded to 1" x 8tpi and includes 3/4" x 16tpi headstock spindle adaptor; Chuck body weighs 4 lbs and is 4" in diameter. Includes #1 step jaws 3/32" to 1-7/8" External & 11/32" to 3-3/8" Internal. Includes #2 round jaws 1-1/2" to 3-1/8" External & 2" to 3-7/8" Internal. Includes screw chuck, allen wrench, and a set of tightening levers. This "C-Series" chuck is compatible with all "C-Series" jaws and accessories.