BlastOne nozzle holders are available in a variety of materials including brass, nylon and aluminium. Nozzle holders are available in both fine (NPSM) and coarse (Contractor) thread. Use only undercut screws to attach to blast hose. Contact BlastOne for instructions on correct fitting of nozzle holders. BlastOne nozzle holders are installed on the end of blast hose using an external friction fit with sealant and short screws. Screws are to penetrate the out side wall of the hose only. Screws penetrating the inner wall of the hose will cause premature hose failure.