Geevorks 10/20/30/40W Module 450nm Engraving Head Laser Head Fixed Focal Length

Wave Length: 450nm. Laser Power: 10W/ 20W/ 30W/ 40W(Optional). Efficient Work:with adjustable focal length (5.5W/ 10W/ 20W) or fixed focal length (30W/ 40W/80W), flexible and easy to use, ensures fast, clear engraving with high efficiency, high precision.

eBay