Insulation Dome Capped Washer manufacturer Galvanized Insulation Dome Cap are assembled by a galvanized cap and a galvanized inserted washer, they are used for our CD Weld Pins, self adhesive Insulation Stick Pins, perforated base insulation stick pins, Dome Caps are used mainly for safety in an insulation install to cover the sharp pin ends, firstly secure the insulation with a self locking washer and then place the dome cap to cover the pin ends, it also makes for an aesthetically pleasing install, the hole on the dome cap is depend on the pin gauge, so when you ordering, please indicate gauge pf pin. The galvanized dome caps are available in 22mm and 38mm diameter, the hole size is available for 12 Gauge, 11 Gauge, other sizes are available per special order. The surface can be painted in white or black to match the insulation color. Dome Cap diameter: 22mm, 28mm, 38mm Insert Self Lock Washer Size: 12 Gauge, 11 Gauge Available Finishes: Silver / White / Black Package Sizes: 1,000 Pack Silver Dome Caps are the most economical and can be painted to match any color insulation. They also are used on FRK faced material. Black Dome Caps are the preferred choice when installing Black Fiberglass Acoustic Board or with black fabrics. White Finish Washers are used on ASJ faced material or white fabrics.Insulation Dome Capped Washer manufacturer website:http://www.xinzeinsulationfasteners.com/insulation-dome-capped-washer/