The product is featured as small size and good model, higher power rate compared with the laser tube of similar length and longer service time, which is suitable for laser marking, laser cutting and laser engraving. Power: 45-50 Watt Length: 800mm Diameter: 55mm Water Cooling Thanks for your purchase of laser tube in our store. The product does not include laser tube holders. We tested 100% work and packed well then ship out. Anyway cause it's glass tube so fragile and sometimes maybe get broken in transit even we packed well. .