Specification: Item Type:Lens Set Laser Reflective Mirror: Material: Silicon Coating Band: 10.6m Diameter Tolerance: +0/-0.1mm Thickness Tolerance: 0.1mm Surface Type: /2per1in Dia Surface Quality: 40-20 Diameter: Approx. 20mm / 0.8in Thickness: Approx. 3mm / 0.1in Applicable Power: 60W-300W (high power) Laser Focusing Lens: Material: Zinc Selenide Focal Length: Approx. 50.8mm / 2in, 63.5mm / 2.5in Diameter: Approx. 20mm / 0.8in Thickness: Approx. 2mm / 0.1in Scope of Application: Focusing lens is widely used in processing and is an indispensable accessory for engraving machine, marking machine and cutting machine The focusing lens is the optical path accessory of the machine. Used to focus the beam after reflecting the lens to achieve the purpose of engraving or cutting How to Use: 1. For cutting leather, wood boards and other dusty environments, wipe it at least once a day. Use a cotton swab to wipe gently from the inside to the outside. Wait for evaporate before processing. 2. After replacing the focusing lens, you need to fine-tune the focusing lens barrel up and down to see which height is the smallest. Package List: 3 x Reflective Mirror 1 x Focusing Lens Note: 1. Install in the head with the concave surface facing down and the convex surface facing up.2. Depending on the specific usage, wipe 1 or 2 times a day: use a cotton swab or lens cleaning paper, gently rotate the wipe from the inside to the outside, and then process after evaporates.3. The hits the edge of the lens and the junction of the lens barrel, which is easy to crack.