Description: It is especially suitable for grinding flash, burr and polishing of machinery manufacturing, hardware tools, die castings, daily hardware instruments, meters, ironwork, woodworking, tire industry, shipbuilding, mold industry, shoes industry, manufacturing industry, etc.. Application: It can be used for spot welding grinding, burr removal, chamfering removal, coating operation, surface grinding, rough grinding, surface polishing, roughing and rust removal. Attention: 1.Please apply 2-3 drops of hydraulic oil to the air quick coupling before formal work. 2.Please allow the sander to run freely for about 20 seconds before work.3.Please make sure the air inlet is clean and free of dust particles.4.Please clean the air filter of regulator valve to keep air flosmoothly. Package includes: one 1/4 inch air belt sander & 12Pcs Air Belt Sander Belts( 3/8"x13" )( #40，#60，80#，120#,3 for each).