Well ultraviolet resistance and aging resistance. Max Inner Diameter of hemisphere:Approx.110mm/4.33inch; Outer Diameter:Approx.130mm/5.12inch; Height:Approx.57mm/2.24inch.
Center distance of locating hole: Approx.85mm(3.35inch) / 120mm(4.72inch); Width of edge:Approx.10-12mm; Diameter of locating hole:Approx.3mm/0.12in.