Home Furniture & Seating Seating, Tables & Pedestals Seat Hardware Regular Mainstay Adjustable Height Package with Swivel – 2-3/8″ (Adjustable Height: 14″ to 20″) Springfield Marine Regular Mainstay Adjustable Height Package with Swivel – 2-3/8″ (Adjustable Height: 14″ to 20″) $368.19 Regular Mainstay Adjustable Height Package with Swivel – 2-3/8" (Adjustable Height: 14" to 20") quantity Add to cart Product Details Product Details Adjustable Height: 14″ to 20″ Anodized aluminum post. Diameter 2-3/8″. 9″ round anodized base. Air-powered height adjustment. 500 Newton cylinder. Locking Trac-LockT swivel. Display package. ABYC Class: (AD) H-31 Driver.
