As the tube holding diameter can be adjusted, this holder can hold those laser tubes with diameter of 50cm to 80cm, which has good compatibility and versatility. Lifting screw is adopted to adjust the height of this laser tube holder, choice material is adopted to make it anti-aging and fine workmanship allows it to fix the tube firmly without deviation of optical path. These laser tube holders are mainly made of fireproof ABS, which is anti-corrosion. The length of this set is 17cm, the width of it is 11.5cm and the height of it is 6.7cm. It is an ideal auxiliary tool for CO2 laser engraving machine. Item Name: Laser Tube Holder Material: Fireproof ABS Applicable Range: CO2 Laser Engraving Machine Features: Compatible, Stable Fixing, Simple Installation Size Details: Applicable Diameter: 50mm-80mm/1.97"-3.15" (Approx.) Laser Tube Ground Clearance: 80mm-100mm/3.15"-3.94" (Approx.) Height: 105mm-170mm/4.13"-6.69" (Approx.) Base Size: 115mm x 67mm/4.53" x 2.64" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 2 x Laser Tube Holders