... . 4) "LM"means metric standard type,"OP" means open type,"AJ" means adjustment type.Applications: Widely used in the defense, precision ... .Model:LM...UU: LM...(sylinder), LM...OP(open type), LM...AJ(clearance adustable) LME...UU: LME...(sylinder), LME...OP(open type ... ), LME...AJ(clearance adustable), LM...LUU & LME...LUU: Long type KH: High ...