Top Fittings create an attachment point and function as a pivot point as part of a Bimini top system. For use as a top cap for 7/8”-1-1/8” round tubing or as an insert for 3/4” or 7/8” OD tubing. Also available as an insert for 1-1/4” square tubing (1” x 1” inside dimensions) commonly found on pontoon boats. 1/4” or 5/16” pin size. Set screws can be purchased separately (299999-1). Requires 1/8" Allen wrench to install. Constructed of corrosion resistant investment cast 316 stainless steel. *Stainless tube wall thickness 0.049”.