You will now always have the right center available for any spindle mounting application. With this convenient, all inclusive 7-piece set you'll have the exact center you need every time. An unbeatable value. This set includes: three - 4 prong spur centers and three multi toothed Super Centers. All centers include spring loaded center pins for easy spindle mounting and removal. Center sizes are 5/8-Inch, 1-Inch, and 1-1/2-Inch diameters in both 4 prong and Super Center styles. Includes 1-Inch by 8 tpi headstock mount to easily screw the centers on and off your headstock. Delivered in convenient wood carry / storage case.