For floating dock applications where an outside corner is not necessary. Includes 4 heavy duty inside corners and 4 backer plates. 85225F Requires 32 x 2-1/2\" x 3/8\" carriage bolts, lock washer and nuts (not included). 85210F Requires 32 x 2-1/2\" x 1/2\" carriage bolts, lock washer and nuts (not included).