The L1079BKH28 is a black child-resistant lid made of polypropylene (PP). A child-resistant closure (CRC) is a lid with a secure mechanism, which is one of the only suitable styles of lid for packaging potentially hazardous products. This lid has a pictorial image embossed on the top showing how to operate the child-resistant mechanism, making it ideal for use worldwide. The lid will fit containers with an 70-400 neck finish and includes a heat induction seal (HIS) liner, already placed inside the cap. An HIS liner is a metallic disk that provides an airtight, tamper-evident hermetic seal when an appropriate heat induction sealing process is applied. This "universal" liner is suitable for use with plastic or treated glass containers. For more information on heat induction sealing and available machinery, please read our article, How to use HIS liners and a heat induction sealing machine. The first number refers to the diameter of the container's opening (in mm). The second number refers to the thread/style/depth of the closure's skirt. Please read 5 seals and how they make perfect liners for your container for more information on liner types.