These racks were designed specifically to work the KinExA Autosampler. The 48 Sample Microcentrifuge Racks are designed to fit on a Microtiter plate holder. The rack is arranged in the standard 8 × 12 array however tube placements are in every other position to accommodate microcentrifuge tubes. Standard Microtiter 8 x 12 pierceable or septum pierced covers fit on top of the racks. These racks are specifically designed to fit 1.5 mL Small Volume Tubes that reduce the amount of sample dead volume required.