TACO Stainless Steel Twist Lock Base f/J-Lock Sunshade - 90 Degree [F16-3490]Stainless Steel Twist Lock Base for J Lock Sunshade 90 Degree A high polished, marine grade (Type 316L) component used in boat hardware for securely holding items like fishing rods or poles at a fixed 90 degree angle, featuring a J Lock system for easy, locked setup, often found on T tops and hard tops for boating accessories.