EPDM Rubber Insulation For Noise Reduction Complaint With DIN 4109 Material: Carbon Steel. Size Range: 3/8" Through 8" Finish: Electro Galvanized / Zinc Plated. M6 Side Screws With Two Pieces Of Gasket. M8+M10 Nuts For Size 3/8" Through 2" M10+M12 Nuts For Sizes 2 1/2" Through 6" M16 Nuts For Size 8"