PFERD Mini mounted flap wheel with 1/8" shank and aluminum oxide A grain are recommended for all materials. The coated abrasive flaps are arranged radially around the axis of the flap wheel in a fan-type configuration. Due to their flexibility, they adapt ideally to the contours of the workpiece. The abrasive grit is embedded in a resinoid bond on the strong, flexible backing cloth. PFERD mounted flap wheels are designated "flap wheels with shaft" according to ISO 3919. Advantages: High flexibility; High stock removal due to the aggressive coated abrasive; Carrier material wears off uniformly and without residue on the workpiece surface, meaning that sharp abrasive grit is exposed at all times; Due to the flat cast core construction, the face of the mounted flap wheels can be used to work very close to edges and in corners. Application examples: Fine grinding on radii in tool and mould construction; Machining of small and hard-to-reach areas in apparatus engineering and tank construction; Machining of fittings made out of non-ferrous and light metals; Grinding of turbine blades in aircraft engine construction and repair. PFERDERGONOMICS recommends mounted flap wheels to sustainably reduce vibration and noise levels during use and to improve working comfort. Specification: Diameter (inches): 3/8; length (inches): 3/8; Shank diameter (inches): 1/8; Recom. Speed RPM: 38,000; Maximum Rotational Speed (RPM): 75,000; Abrasive: Aluminum Oxide A; Grit size: 80.