PSI Woodworking Products LCENTSET 7-Piece Multi Spur Drive Center Set With A 1-Inch by 8 TPI Mount 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