grease fitting material:iron with zinc plated available size:m6*1,m8* ... 1 shape:straight,angle hydraulic type GREASE NIPPLE/GREASE FITTING Material:iron/mild steel,stainless steel,brass/copper ... NPT , SAE, UNF, UNEF, BSF Type:Button head type, Hex type, Pin Type, Square Type, Long type, Double head ... professional factory, we can produce all types grease fitting customer need and also we can offer OEM. ...