Product Manufacturing Process and Materials: High density aluminum alloy, Lighter Weight, Higher Strength. The contour of the product is made by the latest CNC machine in Germany, which makes the product more accurate. Higher requirements for environmentally friendly anodizing process to minimize manufacturing pollution. Minimalist packaging to reduce carbon emissions. Product Adaptation: For bike stem top; Compatible with AirTag. Ultra-fine thread pitch for perfect waterproof without additional sealing rings. Item Included: Aluminum alloy cover x1; Aluminum alloy base x2; Stainless steel screw x1; Protective Sticker x 2. Item Size: 1.46 x 1.46 0.39 in; 3.7 x 3.7 x 1 cm. Weight: 0.03 lb; 0.49 oz; 14 g.