This laser head is for the DIY CO2 laser machine. It's designed to carry a focal length 50.8mm (20mm dia.) focus lens and a 25mm reflection mirror. It has a limit switch which can be used for auto setting the z table height position. Our XLE adapters can be attached to it to use different focal lengths' lens.
Suggested tube to be used with the air plug: 5X8 Silicon Flex Tube for Air Assistance or Water Cooling