Features:1. Package including 21pcs lenses in total, includes lenses with different specifications, from 35mm to 45mm.2. With thickness of 1.2mm/0.05in, which makes it more convenient to fit the watch frame perfectly.3. Highly transparent, smooth treatment, no scratches, smooth and high temperature resistance.4. Made of high qualiy material of mineral glass, which makes it and have high reliability.5. Professional manufacturing, superb craftsmanship and high accuracy help to provide the best performance.Specification:Item Type: Flat Watch Glass Lens SetMaterial: Mineral GlassLens Thickness: Approx. 1.2mm/0.05inLens Diameter: Approx. 35mm, 35.5mm, 36mm, 36.5mm, 37mm, 37.5mm, 38mm, 38.5mm, 39mm, 39.5mm, 40mm, 40.5mm, 41mm, 41.5mm, 42mm, 42.5mm, 43mm , 43.5mm, 44mm, 44.5mm, 45mmPackage List:21 x Lens