MARINE BOAT STAINLESS STEEL 316 RATCHET MOUNT ANTENNA BASE FLAG POLE SOCKET SS 316 composition. Standard marine antenna threads. Base Dimension: 2 1/4" by 3.5" Upright height from Base to thread is 4.5" Lever length: 4.5"3 Distance between center of mounting holes: 3" and 1 3/4" Item: P80245