Durable Material:The boat seat pedestal is made of strong and durable anodized aluminum for durability and corrosion resistance. Height Adjustable: Our seat base is height adjustable from 14"-20" and we designed it with 7 locking positions so you can easily adjust the seat height. Compatible with all brands:this boat seats pedestal Predrilled seat fixing holes, that fits boat seats from all brands.Especially for boat chair bases with adjustable sliding plates, there are more reserved holes on the sliding plates, which have a wider range of applications. Boat Seat Pedesta