erfect for bicycle seatposts and handlebars, ski poles and more Fits 0.75 to 1.4 (19.5mm to 35.56mm) diameter tubes Fits smaller.43' to 0.7' (11mm to 18mm) diameter tubes with included adapter Can be clamped to a pipe or pole to create a handheld boom 3-Way Pivot Arm allows for easy aiming Protective liner prevents marring on mounting surface and enhances stability Compatible with all GoPro HERO Session, HERO7, HERO6, HERO5, HERO4, HERO3+, HERO3, SJCAM, Xiaomi Yi 1 Action Cameras.