Made up of Heavy Duty Stainless Steel Antenna Base Mount extension mast with male and female, high-quality material and long-term durability. | It is very durable and long-lasting, constructed of corrosion-resistant machined 304 stainless steel. | Easy to use a strong and sturdy fine finish with an innovative design for boats, yachts, kayaks, and marines, suitable for small VHF. GPS or TV antennas. | Dimensions: Length: 6” (152.4 mm); Tube O.D: Φ1-1/16” (26.9 mm); Tube I.D: Φ0.9” (23.0 mm); pipe wall thickness:2.5 mm. | Package Includes One section MARINE CITY Heavy Duty Stainless Steel Length 6 Inches Antenna Base Mount extension mast with male and female 1"-14 threads (Mounting Screws Not Included).

Made up of Heavy Duty Stainless Steel Antenna Base Mount extension mast with male and female, high-quality material and long-term durability. | It is very durable and long-lasting, constructed of corrosion-resistant machined 304 stainless steel. | Easy to use a strong and sturdy fine finish with an innovative design for boats, yachts, kayaks, and marines, suitable for small VHF. GPS or TV antennas. | Dimensions: Length:12” (304.8mm); Tube O.D: Φ1-1/16” (26.9mm); Tube I.D: Φ0.9” (23.0mm); pipe wall thickness:2.5mm. | Package Includes One section MARINE CITY Heavy Duty Stainless Steel Length 6 Inches Antenna Base Mount extension mast with male and female 1"-14 threads (Mounting Screws Not Included).

Made up of 304-grade stainless steel, glossy polished finish, with corrosion resistant, sturdy and durable, long-lasting life. | Designed to allow the cable to feed directly through the base, eliminating the need for a separate cable buttonhole, when filled with silicon sealant, it will make an airtight fit. | Easy to use a strong and sturdy fine finish with an innovative design for boats, yachts, kayaks, and marines, suitable for small VHF. GPS or TV antennas. | Dimensions: Height: 4-1/4" (104.9 mm); Base Diameter: 3.03 inches (77.0 mm); Tube. O.D: 1 inch (25.4 mm). | Package Includes Pack of 1 MARINE CITY Fixed Antenna Base with 1"-14 Thread Formed (Not Include 1/4” RH fasteners).

Insulated stand-off bracket of white molded plastic, Corrosion resistant. Easy-open for quick lay down. | Stand-off insulators keep vertical antennas vertica, Aiming RF energyenough toward the horizon | Heavy-duty upper standoff bracket for high-dB VHF antennas and SSB antennas. Accommodates 1”、1-1/8”、1-1/4”、1 1/2'' dia. antennas. | Dimension:4.6"(117.0 mm)H; 4.84"(123.0 mm)W | Package Contents: 1 pc MARINE CITY Marine Mounting Kit Heavy Duty White Nylon Antenna Stand-Off Upper Bracket (Includes bolts, nuts and lock washers)(Not Include metal extension).