Cleat used to anchor your boat to the dock. We recommend using a cleat for each 10' (3 m) length. For example: a 25' (8 m) long boat = use 3 cleats. Our docks move all the time, as does your boat, thus avoiding any unnecessary tension on the cleats. However, when you expect severe weather conditions, we recommend to tie it directly to the ears or pass it through the exterior lug connector. Our cleats are made of highly resistant plastic but less resistant than metal ones can be.