Introducing our factory-made Clear Headspace Vial Metal Caps, specifically designed for GC GCMS instruments. With an 18mm screw, these high-quality caps ensure a secure and leak-proof seal for your headspace vials. Our factory's expertise guarantees top-notch manufacturing, delivering reliable and durable products. These metal caps are essential for maintaining the integrity of your samples during analysis, providing utmost accuracy. Invest in our factory-made vial caps to enhance the performance of your GC GCMS instrument and optimize your scientific pursuits.