The HB-1 is a high quality, precision-machined tool designed to give a lifetime of use. Manufactured from alloy steel and fully heat-treated the HB-1 utilizes a Torrington thrust bearing and washers for smooth, effortless installation. This kit includes all the necessary bolts and adapters for use on crankshafts that are tapped for 3/8", 7/16", 1/2", 5/8" and 3/4" SAE threads. Special metric adapters are also available and can be quoted upon request.Manufactured by BHJ.