MT2 Revolving Tube Center 1/2" - 2 1/2" (12.5mm - 63.5mm) approx -Ideal for holding pipe and hollow work, Large Diameter Centers, cored holes and for tube work. -Preloaded well greased multi bearings to achieve good thrust and radial capacities. -While regreasing, use only the high class bearing grease/oil through the grease nipples provided in the tail and on the body of the Revolving Center. -Head Made from heat treated hardened high carbon alloy steel -Head hardened to 55-60 HRC