The perforated base pin is a insulation hanger,Website:http://www.insulationpin.net, it is fabricated by a perforated metal base with a pin, the base is 1.5"×1.5" or 2"×2" metal base, the pin is made from 12GA steel wire. They are used for fasten the insulation, working with a self-locking washer.MaterialStandard material:Low carbon steel Special order: Aluminum or stainless steelPlatingPin- galvanized coating or cooper platedBase: galvanized coatingSelf-locking washerAvailable in all kind of sizes, shapes, materialsSizePerforated base: 1.5"×1.5", 2"×2"Pin diameter: 12GA( 2.7mm)Length1" 1-5/8" 2" 2-1/2" 3-1/2" 4-1/2" 5-1/2" 6-1/2" etcAccept customization for other lengthsApplication1: clean surface2: Apply adhesive to perforated base pin3: stick anchor in place and wait the adhesive dry.4: install insulation5: press the self locking washer onto pin and bend over the pin or clip off the pin