These wedge-shaped components slide in for a snug, stable fit. The type B seat mounts are designed to "lock" into the post. Heavy-duty bushing with peripheral bearing system is sized for exact fit. 2" dia. posts feature a satin-anodized finish. Power pedestals include integral seat mount. Strong base plate has reinforcing ribs to withstand tough conditions.2" diameter. Adjustable height from 13" to 19". Snug, stable fit Satin-anodized finish | Wedge 2" Adjustable Power Pedestal with Seat Mount, 13"-19"