CM / CF	2-piece, metal to metal
CM-T / CF-T	2-piece, PTFE lined, self lubricated
CM Special	2-piece, metal to metal special bore sizes
SCM-T/SCF-T	2-piece, stainless steel with PTFE liner
CM-M/CF-M	2-piece, metric, metal to metal
SCM-MT / SCF-MT	2-piece, stainless steel with PTFE liner
CM-Y / CF-Y	2-piece, metal to metal with studs
CMX / CMX-T	2-piece, metal to metal, heat treated, alloy steel