Open Open Steel Strapping Seals have open legs to permit them to be snapped onto the overlapping strap-ends prior to tensioning. Push Type Push-type strapping seals have closed overlapping legs to be used with push-type tensioners for steel strapping. Magazine Magazine seals for strapping tools and machines. Open seals in clips of 50 or 100 pieces for easy loading of seal magazine. Used with combination strapping tools and strapping machines. Cross-Tie Cross-tie seals have open legs and are snapped onto straps perpendicular to each other to keep steel straps in position.