These 4 x 5/7ml inserts are designed for use with the Z326-100H rotor by Benchmark Scientific. Each pack contains 2 inserts. These inserts are ideal for securely holding 5/7ml tubes in place during centrifugation processes. Made of durable materials, these inserts ensure stability and prevent any potential slippage or disruptions during operation. By utilizing these inserts, users can optimize the capabilities of their Z326-100H rotor, enhancing the efficiency and accuracy of sample processing. Whether working in research, clinical, or industrial laboratories, these inserts provide a reliable solution for accommodating 5/7ml tubes, streamlining workflow and promoting consistent results. Upgrade your centrifuge setup with these inserts to experience seamless operations and reliable performance in your laboratory environment.