Feature: 1. Using domestic zinc selenide, the light transmittance is 99.5%, the coating is firm and durable 2. The laser focusing lens is widely used in laser processing and, an indispensable accessory for laser engraving machines, laser marking machines, and laser cutting machines 3. The focusing lens is the optical path accessory of laser machine. Finally achieve the purpose of engraving or cutting after the reflecting lens is used to focus the beam 4. The substrate of the silicon reflective lens is silicon, which has good optical and thermal properties. After the reflective film is coated on the surface of the silicon, greatly improved reflectivity, about 99%, and the loss of light caused by reflection is almost avoided 5. Come with good optical thermal properties, high reflectivity, gold‑plated film with scratch resistance. Adapt to work in harsh environments with long service life Specification: Item Type: Laser Lens Set Laser Reflective Mirror: Material: Silicon Coating Band: 10.6μm Diameter Tolerance: +0/-0.1mm Thickness Tolerance: ±0.1mm Surface Type: λ/2per1in Dia Surface Quality: 40-20 Diameter: Approx. 25mm / 1in 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: Laser focusing lens is widely used in laser processing and is an indispensable accessory for laser engraving machine, laser marking machine and laser cutting machine The focusing lens is the optical path accessory of the laser 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 Mirror1 x Focusing Lens Note: 1. Install in the laser 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 laser hits the edge of the lens and the junction of the lens barrel, which is easy to crack.