Marine Boat VHF Antenna Ratchet Base Clamp On / Rail Mount 316 Stainless Steel Precision cast 316 marine grade stainless steel.Maximum corrosion resistance and durability in the saltwater environment.Polished to a beautiful mirror-like finish.Accepts all standard antenna 1 -14" threads. For 7/8" to 1" diameter pipe / railings. Destination custom duty is not included in the listing price; it is the customer's responsibility to pay for custom duty if any.Shipping by China Post Registered Air Mail with shipping tracking number provided. It will take about 4 weeks’ time to deliver to you after shipping out, some countries may take longer time to deliver. If you want faster delivery, please contact me for shipping upgrade.