Instantly change your chuck jaws; Remove and replace all 4 jaws in less than a minute; Jaws will snap into place for a secure mount; Use the included jaw removal tool to pop them off the chuck body. Instar-Change Jaw Chuck System includes: Barracuda Chuck Body, Set of #2 Round Jaws, Set of Pen Blank Drilling Jaws, Woodworm Screw chuck, Jaw Tightening Key, Jaw Removal Tool, Storage Case. Barracuda Chuck Body: Pre-threaded at 1" x 8tpi, Weighs 4 lbs. , Diameter 3. 5", Enclosed back plate with indexing. The included #2 Round Jaws have an exterior work piece grip range of 1-1/2" to 2-5/8" and an interior work piece grip range of 2" to 3-3/8". For all of your woodturning projects from pens to peppermills to bowls, the following jaw styles are available separately: #3 Wide Bowl Jaws (CSCBARB), #1 Step Jaws (CSCBARS), Pin Jaws (CSCBARP), and Super Finishing Jaws (CJAWXL52).