HDPE Welding Rods Dia.3/20 In with Black Color for Extrusion Welder Booster Go to amazon.com Related posts Best extrusion welder for 2022 FeatureMaterial: HDPESize: Dia.4mm (3/20 In)Color: BlackPackage: 5kg / pack DescriptionWelding Rod, High Density Polyethylene, with Diameter 3/20 In. is used for extruder booster for plastic container welding.