Double Convex round Lens, Material: Glass, designed for physics and educational uses, Because of their educational use design, there may be minor imperfections that do not affect physical function, for educational uses, Size: 150mm focal length, 2in diameter and 8mm thick
Plug Switch - Two Way Three Brass Blocks With 4mm Insulated Terminals With Tapered Plug With A Fluted Top Are Mounted On A Molded Base, With Three Brass Blocks, Each With A 4 mm Insulated Terminals And Two Standard Tapered Plugs To Fit The Two Holes Between The Blocks.