The safe screw cap micro tube developed by Sarstedt AG & Co. over 25 years ago is an ideal accessory used in a variety of applications. People needing high level storage of samples like in medical research, pharmaceutical industry and biotech industry widely use these screws to keep the samples well-protected and sterile. Samples requiring the utmost security and purity can also be protected with the screw cap. Fashioned to perfection, these tubes are certified PCR Performance Tested in purity. Top quality synthetic oligonucleotides, enzymes, and buffers are stored with the help of this accessory. It is the perfect choice while centrifuging and transporting samples.