Help your seat stay nice and snug in place, when you pair this base plate, with the Wedge 2-3/8" Adjustable Power Pedestal & Integral Seat Mount. You can have a sturdy and steady place to rest your tush after a hard day of pulling in your limit. 9" Round Brushed Aluminum ABYC Code: AO Required Mounting Hole Diameter: 3.25" Depth Below Deck: 2" Wedge shaped components slide in for a snug, stable fit Type B mounts are designed to "lock" into post Engineered to prevent unintentional detachment Heavy-duty bushing with peripheral bearing system and exclusive "crush ribs" are individually sized for exact fit Tubing comes in several styles. Pedestals come in several lengths, including patented "J-Slot" adjustable height Precisely position locking tab positively locks post to base Wedge(TM) bushing locks in with a tight, solid fit 2-Point stainless steel riveting strengthens the bushing Strong base design has reinforcing ribs and improved profile to withstand the toughest conditions Bead blasting closes aluminum porosity Brushing process provides long-lasting high-sheen finish