The Astro Pneumatic 1222 Straight and Angle Die Grinder Kit is designed for heavy duty grinding, casting cleaning, and weld smothering. It can be used with carbide burrs or mounted points. Wide range of functionality includes mechanic and body shops, fabrication shops, shipyards, foundries and industrial plants. 1/4-inch collets. 1240 - Blue Composite Body 1/4-inch 90 degree Angle Die Grinder, Specifications: Collet Size:1/4-inch, Free Speed:20,000rpm, Overall length: 5-inch (127mm), Net Weight:1-pound (.45kg), Motor:1/3hp, Air Inlet Thread NPT:1/4-inch, Air Hose I.D. Size: 3/8-inch (10mm), Avg. Air Consumption: 3cfm, Sound Pressure: 92.3 db(A), Sound Power: 103.7 db(A), Air Pressure: 90-120psi. 1206A - Composite Body 1/4-inch Medium Die Grinder, Specifications: Collet Size: 1/4-inch, Free Speed: 22,000rpm, Overall Length: 6-3/4-inch (171mm), Net Weight: 1-1/8-pound (-1/21kg), Motor: 1/3hp, Air Inlet Thread NPT: 1/4-inch, Air Hose I.D. Size: 3/8-inch (10mm), Avg. Air Consumption:. 3cfm, Sound Pressure: 89 db(A), Sound Power: 100.8 db(A), Air Pressure: 90-120psi.