1The laser head integrated installation kit is suitable for laser engraving and cutting machines. 2The reflector frame can be equipped with a 20mm reflector lens, and the focusing lens barrel can be equipped with a 20mm focusing lens. 3Made of aluminum material, it has high strength and corrosion resistance, and it is not easy to deform after long time use. 4The laser head mounting bracket has standard mounting sizes and thread specifications, and the mounting is tight. 5Exquisite workman and strong practicability, it is a good replacement for laser engraving machine. Item Type: Laser Lens Mount Laser Head Focal Length: Approx. 50.8mm / 2in, 63.5mm / 2.5in Mounting Base Size: Approx. 26 x 28mm / 1 x 1.1in The Difference Between 50.8 and 63.5 Focusing Lens Barrel: The female thread of the lower end of the 50.8 focusing lens barrel is shallow, and the female thread of the lower end of the 63.5 focusing lens barrel is deep. Lens Diameter: Approx. 20mm / 0.8in 1 x LaserLensMountThe reflector frame can be equipped with a 20mm reflecting lens, and the focusing lens barrel can be equipped with a 20mm focusing lens. Check whether the product size is appropriate.