The self stick pin is a insulation hanger,Website:http://www.insulationpin.net, it is fabricated by a 2" X 2" metal base with a 3M tape on the back riveted with a pin, we also call it as self-adhesive pin or peel&press pin, it works with a self locking washer to fasten the insulation, different from the perforated base pins, they are used for sticking onto new or clean sheet metal of insulation construction.MaterialLow carbon steel, Aluminum or stainless steel.PlatingPin: galvanized coating or cooper platedbase: galvanized coatingSelf-locking washerAvailable in all kinds of sizes, shapes and materialsSizeBase: 2"×2"Pin: 12GA( 2.7mm)Length1" 1-5/8" 1-1/2" 3-1/2" 4-1/2" 5-1/2" 6-1/2" etcAccept customization for other lengthsApplication1: clean the surface2:Peel off backing3: stick pin in place4: pressure the pin5: wait 15-20 minutes6: Install insulation and secure with self locking washer