The CYCLONE SNAIL LOCK SYSTEM by Diamax is designed for use on an auto edge machine, such as a Pro-Edge. Materials: Engineered stone, granite. Wet use only. Fits most auto-edge profile machines with new formula which ensures even wear and longer life. Best for bull-nose shaping & polishing. Copper bonded position #3 ensures longer life compared to standard resin. For RPM please consult your machine technical specs. Size: 4". POSITION: 3. Bond. resin. Fitting: Snail Lock. Parameters: 30-35 PSI.