Quilting pin is a cup head pin made in stainless steel,Website:http://www.insulationpin.net, we usually use 304SS as the material, Quilting pins are used for fasten the thermal insulation, provide support of the insulation material in a blanket or removable pad. In addition to lacing anchors, to fabricate blankets and are secured with a self locking washer.MaterialStainless steelPlatingNo PlatingSelf-locking washerAvailable in all kinds of sizes, shapes, materialsSizeWasher:1.187" 1.5"Pin diameter: 12GA(2.7mm) 14GA(2.0mm)Length2.5" 4.5"Accept customization for other lengthsApplication