This Shakespeare Boat Antenna Mount is stainless steel, for use with 8 inch height antennas, and includes fast release handle.• Connection: Centerpin® PL-259-CP-G• Mounting: Deck or side• Bolt Holes: 9/32â diameter // 3â x 1 1/2â on center• Thread: Standard 1â-14 (male)• Antenna Max Height: 8' 1 Inch x 14 Male Thread Size 9/32 Inch Diameter; 3 x 1-1/2 Inch On Center Bolt Holes With Fast Release Handle, PL-259-CP-G Centrepin Connector | Boat Antenna Mount, Stainless Steel