Among those professional weld pins manufacturers and suppliers in China,Website:http://www.insulationpin.net, China Melparts Precision Manufacturing Ltd is waiting for you to wholesale its low price weld pins made in China from its factory.Weld pins Weld pins is a insulation fastener that is used for fastening the duct liner to the inside sheet metal of air duct, they are designed to work with the auto-feed weld machine. MaterialLow carbon steelPlatingZinc platingSizeWasher diameter: 1"Pin diameter: 10GA( 3.4mm)Length1/2" 3/4" 1"  1-1/8" 1-1/2" 2" 3" 4"