Introducing our high-quality clear headspace vial metal caps, specifically designed for GC GCMS instruments. With a convenient 18mm screw, these caps offer seamless compatibility and easy usage for your analytical needs. As a trusted factory, we prioritize precision manufacturing and exceptional standards to provide top-notch products. These caps ensure a secure seal, preventing any contamination and preserving sample integrity. Trust our reliable and durable vial metal caps for your laboratory requirements.