65x390MM Straight Track Air Sandpaper Machine Recicating Square Pneumatic Grinder Stainless Steel Wire Drawing Machine. Recicating front and rear linear grinding, stable and efficient operation. Comfortable auxiliary grip handle. The front and back are equipped with sandpaper clips for fixing sandpaper. Built in filter screen at air inlet interface. Ergonomic design start switch. Name: Straight Track Air Sandpaper Machine. Recicating stroke: 25.4MM. Gas consumption: 0.45M3/MIN. Working air pressure: 0.65Mpa. Recommended inner diameter of air pipe: 8MM.