This is a quality made laser head mount set for a DIY CO2 machine. It's designed to carry (18mm dia.) 50/55mm focus lens and a 20mm reflection mirror. The tube is adjustable and air assistant option is ready.
Adjustable length: 40mm
Mirror diameter: 20mm
Lens diameter: 18mm
Beam direction: Left to Right
Tip diameter: 27.5mm(O.D), 23.3mm (I.D)
Note: Good for focal length 50.8mm/2" focus lens. If focal length is more than 50.8mm/2", proper replacement tip is required.
Air assisted plug included(picture does not show)