The 18mm screw for GC GCMS instrument clear headspace vial metal caps are an essential accessory for any laboratory. These caps are manufactured in our factory using superior quality materials, ensuring maximum durability and performance. Our product has a clear headspace vial design that allows for easy and accurate analysis of samples. These metal caps are compatible with GC and GCMS instruments, making them an ideal choice for researchers working in the field of chromatography. Our commitment to quality ensures that our customers receive the best products that meet their needs. Order now and experience the best quality of GC GCMS instrument clear headspace vial metal caps.