Rubber 20mm washers for M6 fin bolts. These help protect your board from damage from the fin head, and act to lock in your fin bolt.
Constructed from a soft, but good wearing, compressible, flexible rubber.
Note: these washers are sold individually.
Use 1 no. of these washers per fin bolt.
Note: You need to also use a 20mm stainless steel washer between this and the head of your fin bolt.