IMPAX SELF-DRILLING SCREW is designed for fastening sheet metal to steel load-bearing structures, lightweight profiles. Screw with a sealing washer with a diameter of 14 mm coated with EPDM rubber . Specifications: Material: Hardened steel SAE 1022 Covering: galvanized min. 12 Âlm Pad coated with self-vulcanizing EPDM rubber 14 mm Head: screw head 5/16"- 8mm size 4,8-5,5 Size : 5.5x32 Drilling Capacity (mm): 3-12mm Hooking depth max (mm): 9.0