Faithfull flexible and long lasting aluminium oxide flaps are secured with a resin bond for extra strength and service life.Their design ensures a consistent finish making them ideally suited for sanding shaped and curved work pieces without the risk of clogging. The wheels have built in arbor shaft for securing in the chuck of most makes of power drills. 6mm (1/4in) shank fits all drill chucks. Ref: UTTK10917