Climax Metal W-34EXL 1/2" Hole Nut Type Arbor 3/8" Shank x 4 1/2" OAL Right hand threaded arbor. For mounting various types of abrasive & finishing wheels. Features an open ended threaded mounting shaft with two washers & a locking hex nut. Wheel can be changed without any disassembly. Rust proof finish. Specifications Washer Type Stamped Flanged UPC Code 044861028971