Compact, light weight, easy to operate. Ball bearing structure, strong and durable. Suitable for iron plate, wood, plastic and other grinding, grinding, fine polishing, etc Size of Belt: 10mm x 330mm 16,000 free speed Air inlet 1/4" BSP Average air consumption 4cfm (this is manufacturers rating we would recommend 6 - 8cfm Operating pressure 90psi Comes with 3 belts to get you started. 3 belts included ： 60 、 80 and 120 grit