The 787mmx50mm belts are designed for the Baldor grinder and use on the Sandbox type of hand file. The Huvema uses the 1220mmx100mm. The grip sheets are for the Jon Atkinson type of dual sided hand files in Silicon Carbide. Ceramic is the recomended abrasive although on belts we can supply Zirconium. Grades available from 40g to 600g