Marine stainless steel skin fitting/ thru hull. Durable, made of heavy 100% stainless steel. We care about quality. 24mm Specially designed for Webasto, Planar, Eberspacher, Planar, Chinese and other air diesel heaters. Set includes the installation kit (3 screws, 3 washers, 3 nuts, 1 fireproof UV-proof salt water proof gasket). Delivery terms: for USA - 7-40 days (usually 7-10 business days) for Canada - 30-40 days (usually 30-40 days) If you have any questions - you are welcome)