Metal Boom clamps are Superior than plastic boom clamps and have secure grip. Made by Aluminum Alloy and have high stress area. We suggest using them on the professional DIY multirotor frames, gimbals or anywhere you need a better hardware. Very convenient for 3-axis DIY gimbals, Multicopters, etc. Specifications: Dimensions approx. 45 x 7 x 36mm, Hole spacing: 32mm Material Aluminum Alloy 6061T6 cnc processed Recommended Those lightweight parts can be used to mount any round tube with 25mm diameter securely.