Bosch OSC3DRF 3-Inch Carbide-Grit Delta Rasp For crimping round metal pipe to create a male fitting end Optimal handle span for maximum power and comfortable operating range Crimps heavier gauge pipe Deltacarbidegrit For use on thin set, paint and other material removal quick and easy 3-Inch attach directly to Multi-X Also work with Fein MultiMaster model 636