Mandrel with reinforced screw. Shank Diameter 3/32". Sold Sold individually. Designed for use with flexible shaft units. Small felt cones, felt cylinders, rubberized abrasives and grinding wheels are but a few of the many types of accessories that can be mounted on these mandrels. All are nickel-plated steel unless noted. Mandrels and mounted accessories used improperly are dangerous. Comply with American National Standards Institute Safety Code B7.1 and Occupational Safety and Health Act covering: speed, safety, guards, flanges, mounting procedures, general operating rules, handling, storage and inspection. The correct usage speed depends on the accessory being used.