Ridgid 60382 Model 916 Roll Groover for Model 535 Threading Machine is the most durable and efficient Lightweight portable unit available. Built With a solid durable cast-iron housing it withstands heavy usage yet is Light enough for easy transportation. The 916 features a patented single stroke feed mechanism that allows for accurate operation quickly and effortlessly. The 916 Roll Groover is specifically designed for field service roll grooving applications. The cam-type feed actuation translates into minimum operator effort to form roll grooves. Built With durable cast-iron housing made to With stand extensive field use. The depth Adjustment screw separate from feed mechanism allow for consistent groove depth. Integral feed Handle is part of overall unit. no extra tools required. Optional Roll Sets for: Copper 2"- 6" (Types KLMDWV)1 In. Sch. 1040 Steel pipe. Optional 1-1 and 2"- 6" AWWA Roll Sets.