For extreme conditions hard rock conditions such as Limestone, Marble, Granite and Medium to Hard Shale (10,000 PSI to 28,000 PSI Rock) TCI IADC 500 series sealed bearing cutters. Wear pads up to 16脗茠脙鈥犆傗櫭傗犆傗偓脗鈩⒚偲捗傗偓脗拧脗鈥毭偮⒚偮∶偲捗偮⒚偮∶傗 sizes and a Ring...