... angle:straight,45&90degree size:1/4",1/8",3/8",1/2",5/16" GREASE NIPPLE/ GREASE FITTING/ GREASE NOZZLE Material: carbon steel,stainless steel ... ,brass Metric size: M6, M8, M10, M12, M14,M16 Inch size: 1/2", 1/4", 1/8", 3/8 ... ", 5/16", 1/16", 7/16" and so on Thread Standard: BSPT, NPT, SAE, UNF, UNEF ...