The Astro Pneumatic 1205 Composite Body 1/4" Mini Die Grinder with Safety Lever - 25,000rpm has a composite handle reduces vibration. Rib textured handle provides a firm grip. Lever throttle for feathering control. Front exhaust. Built-in regulator. Collet Size:1/4",Free Speed: 25,000rpm,Overall Length: 4-3/4" (120mm),Net Weight: 13/16lbs. (.37kg),Motor:1/3hp,Air Inlet Thread NPT: 1/4",Air Hose I.D. Size: 3/8" (10mm). Avg. Air Consumption:. 3cfm,Sound Pressure: 92.3 db(A),Sound Power: 103.7 db(A),Vibration Level: less than 2.5 m/s2,Air Pressure: 90-120psi.