Description: Boat cover/ canopy knuckle clamp Fits 25mm/ 1 inch bar or tube outer diameter Round Hole Inner Diameter: Approx. 25 mm/ 1 inch Heavy duty marine 316 grade stainless steel casting Attaching canopy/ cover bars or frames to other bars/frames or deck hinges Dimension: Approx. 73 x 32 x 27mm/ 2.87 x 1.26 x 1 inch (L x W x H) Package Includes: 1 Piece Boat Canopy Tube Clamp