... Description HK (open end, standard series), L (single-side sealed)/ LL (double-side sealed), single-row and double-row (ZWD) types ... are available HMK (open end, heavy load series), L/LL, single-row and double-row types are available BK (closed ... end, standard series), L/LL, single-row and double-row types are available DCL (inch ...