grease fitting: material:mild steel yellow zinc plated size:1/4",1/8",5/16",3/8",7/16",1/2" thread:UNF,NPT,SAE,BSPT,PTF Grease Fitting/Grease Nipple Material: mild steel, stainless steel, brass Angle: straight, 30degree, 45degree, 67.5degree, 90degree Type: long-type, hydraulic-type, button-head type, double-head type square-type, pin-type, ball-type and other special types Metric Size: M6x1,M8x1 ...