Widely used for sanding multi-plywood, MDF, Particle board, Solid wood panel,door, window, wood plastic composite material, etc. RP model: Single head sander is designed for fine surface polishing. R-RP model: Double head sander is designed for thickness calibration, surface sanding and fine surface polishing. Polishing pad can be adjusted up-down to change the pressure acording to different workpiece. Electronic pneumatic abrasive belt tention and conveyor belt tention system.