United Scientific DEMO50 Glass Demonstration Lens Set, 6 Pieces, 50mm Diameter sold2026 Upgraded Flexible Arm: It features

Upgraded Flexible Arm: It features that 13" long gooseneck-arm can be easily adjustable to different bendable position

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easy cleaningEffectively cleans all four sides of a chainSuitable for all bike chainsPerfect gift for any bike loverPackage Included:1 x Bicycle Chain Cleaner3 x Cassette Brushes

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United Scientific DEMO50 Glass Demonstration Lens Set, 6 Pieces, 50mm Diameter sold2026 Upgraded Flexible Arm: It featuresUnited Scientific DEMO50 Glass Demonstration Lens Set, 6 Pieces, 50mm Diameter The set contains 6 lenses, one each of double convex, plano convex, concavo convex, double concave, plano concave, and convexo concave lens. Comes in a reusable cardboard storage box. Product Features Each lens measures 50mm in diameter All lenses have a focal length of approximately 150mm Lenses have ground glass edges Included lenses: double convex concave, plano convex