Standard and heavy duty semi open metal seals made from hard steel, for use with polypropylene strapping. Serrated metal strapping seals produce a stronger and more efficient joint than standard seals and are suitable for use in medium and heavy duty packaging applications. The steel seals withstand higher stress and are ideal for heavy duty applications and continuous use. When ordering metal seals, we advise that you match the correct seal to your strapping width. Free delivery and next day dispatch. Buy with confidence.