The Micronic 48-1 Rack is developed to hold 48 1.00ml (tissue) tubes with Screw Caps. In addition to the standard ANSI/SLAS footprint, the ULT Racks are provided with more features ideal for automation. These features include: an outstanding Twist-Lock design which prevents tubes from turning during screw (de)capping, easy lead-in tube and cover placement, closed side walls with minimal notches for perfect rack orientation, a unique automation-friendly cover lock system with which closing is achieved by simply moving the locker at each end of the cover downwards, and the inseparable 1D rack barcode for absolute tracking and tracing of the samples.