Fits 2.25 to 2.5 (diameter) Round Tubing. Super Tough Glass Filled Nylon Composite. Two Piece Clamp with Rubber Mounting Spacers and Hardware Included. Perfect for Mounting Lights or Many Other Accessories. Sold Individually Two-piece black tube clamp mounting bracket;Super strong glass filled nylon;Designed to mount lights and many other accessories;Rubber adjustment shims included