GPW-7 is a reliable and affordable wet air polisher widely used in stone fabrication industry. Light weight and high quality make it one of the most popular air polisher in stone fabrication and concrete counter top polishing industry. With aluminum body, brass fittings and high quality bearings inside, GPW-7 is one of the most durable air polishers on the market. Center water feed for wet use to eliminate electric hazards Front exhaust port allows user to dry the edge with the tool and inspect their work as they go Can use with 3 in., 4 in. and 5 in. back holders One rigidback holder is included Spindle size: 5/8 in. -11 in. Air hose size: 3/8 in. Sound pressure: 86 dBA Vibration: 2.5> Maximum HP: 1 HP Features Item Weight 5 Tools Product Type Air Tool Tool weight (lb.) 3 Air consumption at recommended operating pressure (CFM) 8 Air Tool Type Disc Sander Compressor/Air Tool Features No Additional Features Included No additional components or accessories are included Maximum sanding speed (rpm) 4500 Project Type Air Tool Combos Returnable 180-Day Recommended operating pressure (psi) 90 Housing Material Aluminum Hose Included Yes Product Length (in.) 9 Air Inlet Size 1/4 Product Depth (in.) 5 Product Width (in.) 6 Product Height (in.) 4 Handle Length (in.) 8 Manufacturer Warranty 30 day refund or exchange