The OTC blind hole bearing puller set is for those jobs requiring an internal pull set includes four collets sizes 7/16 inch to 1/2 inch, 9/16 inch to 11/16 inch, 5/8 inch to 1 inch, and 1 inch to 1-1/4 inch which fit a wide range of applications Select the appropriate sized collet by comparing it with the application. Insert the collet, expand it to fit the hole, and then attach the slide hammer Includes a 2-1/2 pound slide hammer with a T-handle Blow-molded plastic storage case keeps set contents organized and protected from loss