Removable Fin Kit
1/8 inch thick aluminum angle stock that is 1 1/2 inches deep. Includes 4- 5/16 inch stainless carriage bolts & washers, and nylon thumb screws. The fins have square holes to work with carriage bolts for easier installation. The design allows you to move the fins to the inside of the sled in situations where the control is not needed and reduction in friction preferred.