Ridgid 36620 141 npt threader 141 threads 2-1/2" 3" 3-1/2" 4" pipe with one set of dies? 161 threads 4" 4-1/2" 5" 6" pipe with one set of dies? Jaw clutch prevents jamming? Simple adjustment for tapered or straight threads? Cam-type workholder sets instantly? Fully enclosed gearing? Right-hand onlyNote: Threaders are shipped and priced without ratchet and handle.