Features and Benefits: 25,000 rpm; 1/4" collet; 4 CFM air consumption; Tool features drop-in motor, rear exhaust and enhanced mufler system. Lightweight, thermally insulated composite housing reduces vibration. Hardened steel cylinder maximizes air utilization. Grinder's 1/4" collet accepts 1/8", 1/4", 3mm and 6mm shanks.