One BRAND NEW OEM genuine Homelite, Sears, Craftsman COMPLETE TRIMMER HEAD ASSEMBLY RIGHT HAND THREAD WITH .080 STRING (shown as item number 49 in the schematic) Bin # 000998230 FOR THE FOLLOWING MODEL HOMELITE TRIMMERS: (right hand thread, black spool retainer) · HBC18 String Trimmer UT-15075-1–>Boom & Head · ST185BC String Trimmer UT-15039-D–>Boom & Head · ST155 String Trimmer UT-20563-B–>Boom & Head · ST175C String Trimmer UT-20599-A–>Boom & Head · ST175C String Trimmer UT-20599-B–>Boom & Head · GST18 String Trimmer UT-20593-B–>Boom & Head · HGT String Trimmer UT-20583-B–>Boom & Head · HLT15 String Trimmer UT-20602–>Boom & Head · HLT16 String Trimmer UT-20585-1–>Boom & Head · HLT18 String Trimmer UT-20584-1–>Boom & Head · ST155 String Trimmer UT-20539-D–>Boom & Head · ST175G String Trimmer UT-20590-B–>Boom & Head · SX135 String Trimmer UT-20601–>Boom & Head · GSTBC String Trimmer UT-15084-B–>Boom & Head · HLT28 String Trimmer UT-20595-3–>Boom & Head · ST275 String Trimmer UT-20594-1A–>Boom & Head