Long venturi style nozzles yield about a 40% greater production rate than straight  boron nozzles. The internally tapered design of the venture nozzle accelerates and evenly distributes the abrasive over the entire blast pattern. These nozzles are  designed for use with a 1-1/4" I.D. blast for maximum cutting on hard-to-clean surface. SAHY-VSA/B Series  boron carbide  Long venture nozzles This nozzle is designed for job where the nozzle is generally 8 or more inches away from the surface being blasted. For high production jobs-expect longer nozzle life.  Aluminum  or nylon jacket and threads.