Ridgid® bolt threader button die, 1/2 in, UNC, 1/2-13, right hand thread, for use with 00-RB ratchet bolt threaders or 31B, 33B, 35B and 37B 3-way bolt threaders, alloy steel. Ridgid® 38355 Bolt Threader Button Die, 1/2 in Pipe and Conduit, 1/2-13 UNC Thread, Right Hand Thread