Aeroduct Insulation Fasteners (IF) are an economical and effective solution for your insulation fastening needs. Aeroduct insulation fasteners are manufactured and designed to meet SMACNA Standards utilizing steel as per ASTM-A 591. It has a 28 Gauge Metal Base. with a size of 50mm x 50mm. Pins are 12 Gauge Zinc Plated and packaging is done with 500 pieces per box with SW washers.