Drives camshaft bearings smoothly Includes: Driving shaft, driving shaft extension, expander unit, five split driving plugs, two driving collars, centering cone & blow molded case. One complete low cost set that will remove or insert camshaft bearings in nearly all engines from compact cars to heavy trucks. Range of 1.1 25" to 2.69" (28.58 - 68.3mm). Easy on bearings. The expander has a neoprene sleeve over which the split driving plugs are mounted & expanded to size. This tool has two sets of rubber sleeves supplied w/ it for each expanding driver.