Akkerman’s Guide Rod Swivel (GRS-50) performs guided boring steel casing installations in deep, densely compacted ground and soft rock. The GRS-50 family of cutter heads contains four sizes of high-thrust bearing upsizing tools able to withstand up to 50 tons of continuous thrust loads on guided boring, guided auger boring and soft rock pilot tube projects. Cutter heads meet the outside diameter of common steel casing pipe in 24-, 30-, 36- and 42-inch diameters. 800/533-0386; www.akkerman.com