<b>Notice:</b>K40 has differernt structures. Some can use this laser beam set directly. <br>Sometimes, you need to make some modifications to the structure of the machine. <br>If it isn't a direct fit for your machine, maybe you need a custom head mounting plate.<p>Made of aluminium. Integrative fixture mount with air assist nozzle.</p> <p>Mirror Diameter: 20mm</p> <p>Lens Diameter: <b>20mm</b></p> <p>Focal Length of Lens: 50.8mm </p> <p></p> <p></p> <p><b>Packing List:</b></p> <p>1 pcs Laser Head  (High Quality Aluminium Alloy with Air Assist Nozzle, Joint Plate and Belt Fastener)  </p> <p>