Here at BCF we carry a massive range of parts and accessories to go with our huge range of products so no matter what you find yourself needing, if it's related to Boating, Camping or Fishing you're sure to find it. These Black Canopy Bow Knuckles are made of hard-wearing nylon and fit a 22mm tube. They are designed for use mainly in boat biminis, rocket launchers and racks. The design is such that they clip around the tube that the canopy, bimini or launcher is made out of. Once around the pole and in the correct position, they are used in conjunction with a bow knuckle and a thumb screw to secure them - as well as adjust the tension of the canopy, bimini or launcher as required. They suit all available Blueline Biminis. For the full range of biminis, rocket launchers, canopies and all the associated parts and accessories, call into our store and talk to one of out friendly, knowledgeable staff to find the part that is right for you.