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. Built-in regulator. Collet Size:1/4″,Free Speed: 25,000rpm,Overall Length: 4-3/4″ (120mm),Net Weight: 13/16lbs.