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Dear sir,We are one of original equipment manufacturing company like armature testing machine, regulator test machine, high voltage tester, and also safety optical curtain. Further we are improving our product optical curtain.now we need lens (convex) to improving the signal strength of IR.lens diameter is 0.5cm to 1.5cm and the outer side is square. length is 1.8cm and height is 2.2cm. Please suggest your Suitable Products as soon as possible.