The Sample Vault™ Series of NMR tubes with NorLoc™ caps are engineered for the new generation of high-throughput lab automation NMR systems. Designed for use with 96 position carriers that accept either the 103.5mm (4”) or 178mm (7”) with open or closed top caps. NorLoc™ caps have superior holding and sealing capabilities with eliminate either cap or tube failure in your instrument. The patent pending design incorporates a blue band positioned on the tube that aligns with the base of the cap, indicating a properly locked position. For use up to 700 MHz.