This RA2 Pro is compatible with xTool M1, P2, and P2S. The risers are only for M1 while P2 and P2S need the riser base. Click here RA2 Pro: 4-in-1 rotary helps to process different objects such as Roller Rotary, Chuck Rotary, Sphere Rotary, Ring Rotary, etc. RA2 Pro Plus: Contains RA2 Pro and Accessory Kit for RA2 Pro.