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