Nozzle can be divided into ruby nozzles and carbide nozzles according to the material.. When purchase the nozzle, you can consider based on below factors
1. What is the coil winding quality requirement ? .If the coil has strict electronic parameters, please try ruby nozzle, or else you can try hard alloy nozzle.
2. What is your budget? Ruby nozzle cost is higher than hard alloy. However, ruby nozzle has longer service life due to abrasion resistance and friction coefficient of ruby nozzles is much better than alloy nozzles.