Top Fittings create an attachment point and function as a pivot point as part of a Bimini top system. These fittings connect to tubing either as a Top Cap or Top Insert for 3/4 or 7/8 round tubing or 1 square tubing. Pin size 1/4. Constructed of UV resistant injection molded nylon. Available in black or white. *Stainless tube wall thickness 0.049.