uxcell 6PCS 20mm Blue Aluminum Clamp for Carbon Fiber Tube Quadcopter Country of Manufacture: CHINA; Material: Aluminum Alloy Net Weight: 63g; Package Content: 6 x Aluminum Clamp Main Color: Blue; Hole Diameter: 20mm/0.78'' Clamp Size: 32x25x5mm/1.25''x0.98''x0.19''(LxWxH) Screw Size: 20mmx2.8mm/0.78''x0.11''(LxD)