Universal Laser Systems machine, focus lens with holder. 1.5 inch focal length lens.
 
Premium grade lens quality for good quality CO2 laser engraving and cutting.

Fits platforms M, V, X, VLS, PLS.
Indepth Product Information
 
Click for whiteboard presentation for recommendations of various lens focal lengths under different conditions.
 
Click for Synrad's "How to choose the right lens focal length for your application.