Includes four (4) Self-Centering Jaw sets to hold Round and Square Stock for turning, pre-threaded for 1x8tpi, and has an adapter for 3/4x16tpi. spindles, Includes #1 Step Jaws for dowels: 3/32-to-1-3/8-Inch, Holes: 11/16-to-2-3/8-Inch, Includes #2 Round Jaws, for dowels: 7/8-to-1-1/2-Inch Holes: 1-1/4-to-2-Inch, Includes #3 Round Jaws, external grip 3-1/16-to-4-3/8-Inch, Includes Pin jaws which hold inside holes 1-to-2-1/4-Inch, and a screw chuck