FEATURES 1/4" Air Die Grinder comes with a 360 degree rotating rear exhaust muffler safety trigger. Use for heavy grinding works. Can be used as a sander for expandable flap wheels and brushes. SPECIFICATIONS Brand Name Zipp Air Tool USA Item model number ZDG-S235 Size of Collet 1/4" (6 mm) Free Speed 3,500 Operating Air Pressure 90 PSI / 6.2 bar Avg. Air Consumption 5 cfm(141 l/min) Net Weight 2 lbs (0.92 kgs) Overall Length 8-5/8" (220 mm) Min. Hose Size 3/8" (10 mm) Air Inlet Size 1/4 inch-NPT/PT