DescriptionThis item is well made of premium material for durable and practical use. With 42mm in diameter, this glass lens will ensure its practicability through high performance. It is a pefect accessory for scientific experiments.Feature- Color: As shown. - Material: Glass. - Size: 4.2x4.2x1.5cm. - Focal Length: 300mm - Made of glass material, easy to clean. - Widely used in glass, instruments, arts and crafts, projectors, projection lights, photographic equipment. - Beveled grounded edges. - Double convex. - Perfect for use.