TACO 90 Top Cap Ball Socket Mount for 78 Tube Designed with boaters in mind, TACOs Top Cap Ball Socket mount are easy to install. Constructed of 316L polished stainless steel that looks good and will provide long lasting corrosion resistance. A delrin insert eliminates rattling while enabling a wide range of motion and smooth operation. Features Polished marine-grade stainless steel Rattle free Set screw fastner Fits existing side curtains, canvas, tubes Tight secure fit Click here for TACO T