Attach your GoPro camera with this mount to any roll bar within 0.75" to 1.4" (19mm to 25mm) * Material: Plastic,Stainless Steel * With a 3-way adjustable arm,it helps to ensure the angle you want. * Attach your GoPro camera to handlebars,seatposts,ski poles and more to make your camera more stable to shoot. * High toughness and good strength.