Technical specifications: Size: M (medium) Shape: Cylindrical Width: 30mm Length, shaft: 40mm rpm, max. 19000 rpm Tr/optimal from: 4000 rpm to 8000 rpm shank diameter: 6mm outside diameter: 25mm Description:Â Due to their hardness and flexibility, rod felts are used where metric shapes 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