Mxeol black nylon cleats are excellent for kayak or small needs. Boat nylon cleat 4" long x 5/8" tall x 1/2" thick, which tiny cleats size not work for jon boats or larger boats. The boat cleats made using the highest quality components. Open Base Nylon Cleats are designed with a molded-in recess in the base. This traps the sealant in place providing a more watertight seal. 4" cleat small size is ideal for kayak and 6-1/2" cleat is used more for boat, dock, etc.