Glass Lenses Set of Six in Wooden Case - 50 mm Dia, 3 Double Convex (20, 30, 50cm FL) and 3 Double Concave (20, 30, 50cm FL) - Eisco Labs industrial 360 Rotation and 180 flip

360 Rotation and 180 flip offer you a secure grip

and reduces interference during driving

9 relaxing combinations to choose from

and Auto-Power off functions

Perfect Fit: Compact

Glass Lenses Set of Six in Wooden Case - 50 mm Dia, 3 Double Convex (20, 30, 50cm FL) and 3 Double Concave (20, 30, 50cm FL) - Eisco Labs industrial 360 Rotation and 180 flipGlass Lenses Set of Six in Wooden Case 50 mm Dia, 3 Double Convex (20, 30, 50cm FL) and 3 Double Concave (20, 30, 50cm FL) Eisco Labs Optics Lens includes 6 lenses. All lenses have been ground, polished faces and ground edges. All lenses are 50mm. TypesOne of each: double convex, plano convex, converging concave convex, diverging concave convex, double concave, plano concave. Lenses are stored in wooden box with hinges and latch to keep lenses