??Forsun T.C. Reaming Shells have tungsten carbides set on the outside gauge. They give a great performance on some competent, soft to medium hard rock formations. When drilling the proper formations, because of the relative low price of T.C. Reaming Shell, it is a more cost-effective unit than other types of reaming shells, such as Surface Set Type, PCD Type etc. For the dimensions of Reaming Shells, please?? click here.