The ridgid 975 roll groover acts as 2 tools in one it can mount onto the 300 power drive for machine powered roll grooving but is also designed to manually roll groove in place pipe the 975 features patented auto tracking technology for significantly easier grooving the auto track gauge keeps the pipe automatically engaged to the groover throughout the grooving process in addition a depth setting gauge enables quicker repeatable set up when manually grooving the 975s higher gear reduction means