Flap Wheel Threaded Shank Adapter Abrasive Mounting Connector Size 1/4 In.-20 Abrasive Mounting Connector Type Threaded Shank Tool Mounting Connector Size 1/4 in Tool Mounting Connector Type Straight Shank Overall Length 4 in Product Type Flap Wheel Threaded Shank Adapter Outside Flange Diameter 3/8 in Maximum Operating Speed Not Rated