Right now the flush mount base is 5X5 inches. Testing proved it was better to be that size for stability if you are pulling cranks. Stainless Steel screws.
Thanks
see pic.:D
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Also, you can't tell it from these pics, but to remove the pole holder, you just loosen the knobs and it twist and slide from under the knobs. 3-4 seconds at the most. With additional flush mounting plates, you can move the holder in meer seconds from front to back, one side to the other, or wherever you decide to mount additional plates. I get $12 for additonal plates.
To store the pole holders, you remove the knobs and store with the holder. This leaves you with a flush mount plate with flush stainless steel screws.
Thanks for looking:D