Technical specifications: Size: M (medium) Shape: Cylindrical Width: 20mm Length, shaft: 38mm rpm, max. 31500 rpm Optimal rpm from: 6000 rpm to 12000 rpm shank diameter: 6mm outside diameter: 15mm Description: Because of their hardness and flexibility, rod felts are used when metric shapes must be cut to size. metric shapes have to be met exactly. The ZYA cylindrical shape is mainly used around the circumference. The version with frontal perforation (ST-BO) is particularly suitable for frontal use. Materials that can be machined : Stainless steel Aluminium Bronze Copper Brass Titanium Machining tasks Polishing  Â