The Ogre stacked reamer from Melfred Borzall is built for jobs that have a lot of cobbles, shale, river rock, glacial till and hardpan. The tool is designed with a slow taper and deep, spiraled fluting to give it maximum mixing and pumping motion, as well as to efficiently carry away cuttings. Angled fluid jets propel water opposite the reamer rotation to keep carbides clear of debris. Each cutter takes off only a 1/2 inch at a time for smooth, efficient cutting. Varying sized carbide blocks prevent shaft wearing directly in front of the reamer body; while it is hard-facing on all other wear areas and includes curved, hard-faced backup blades for added wear-resistance during pushbacks. Three carbide cutter styles maximize reaming production in a wider variety of tough conditions, with a built-in swivel also available. Shark-tooth, conical aggressive and conical dome cutter options are available in cutting sizes from 8 to 48 inches. 800-558-7500; www.melfredborzall.com