This Chain Gripper Plate stabilizes anchor chains and reduces stress on windlass when anchored in heavy seas. The two holes are used for a bridle application with two Bow Shackles 147212 to connect lines to port and starboard cleats for stabilization. Fits anchor chain sizes 5/16, 3/8, 7/16, and 1/2. Constructed of corrosion resistant investment cast 316 stainless steel. Installs with two RH fasteners not included. Features. Stainless Steel Chain Gripper Plate