Specifications: 1) Collet size: 6mm2) Free speed: 22,000rpm3) Air inlet: 1/4" NPT4) Length: 5.5" / 140mm5) Net weight: 0.66lbs / 0.3kg6) Special 1/4" or 6.0mm inner chuck (collet sleeve) when ordering7) Best for grinding and trimming of molds8) Also suitable for grinding and trimming of stone and metal, and for assembly lines, too9) Applicable to polishing10) With 5pcs 0.118" (3mm) grinding stones and 5pcs 0.236" (6mm) grinding stones Other Price Terms: FOB Payment Terms: T/T, L/C at sight