S40 -580 Air grinderapplying:S40-580 type pneumatic grinder is suitable for grinding flat gate and riser,Website:http://www.nbydtools.com, small and medium sized castings grinding large parts, mould and weld, such as work, such as cloth wheel instead of grinding wheel for polishing operation, with wire wheel instead of grinding wheel can remove rust on the metal surface and old paint layer etc.technical data: Max Grinder Size :40mm Spring Collet Size:6mm Free Speed : ≥17500r/min Air Hose Size: Φ8mm Overall  Length:580mm Net Weight:1.5kg