Cannon Low Profile Swivel Base is corrosion-resistant because of the way it is created. The 316 stainless steel not only prevents corrosion but adds strength. This downrigger swivel base is square with holes on each corner. In the middle circle is another square indention with holes in each of those corners as well. It's all silver in color with a knob on one side.
Cannon Stainless Steel Low Profile Swivel Base - Melton Tackle
Heavy Duty Bar Stool Swivel Replacement Plate Chair Base Mount Part Swivel
TacFire Sling Rail Mount QD Swivel Black MAR064 [FC-811261022195] - Cheaper Than Dirt
Cannon Aluminum Swivel Base Downrigger Riser Pedestal – Natural
SeaLux Universal Heavy Duty 360 degree 7 to 8-3/4 Seat Swivel
Traxstech Swivel Mount Sturdy and Flexible Mount Solutions
DEEP REACH Swivel Base Mounting Hardware Kit
Seahorse® DEEP REACH Swivel Base Mounting Hardware Kit by Troll-Master
Shakespeare Shakespeare 81 Swivel Base Mount Stainless Steel at
SeaLux Universal Heavy Duty 360 degree 7 to 8-3/4 Seat Swivel Base Mount Plate
Cannon Part number2207003.
Cannon Downrigger Low Profile Swivel Base Mount Part Number 2207003
Low Profile Swivel Base, Stainless Steel - Cannon