The Beckman Coulter A83054 Tube Block is a plastic block designed to hold up to 12 tubes in place during centrifugation. It features 12 holes to accommodate 12x75mm, 13x75mm, or 13x100mm tubes. The block is made from durable polypropylene and can withstand centrifugal forces up to 20,000 x g. It has an open design to allow easy access to tubes. The A83054 tube block provides a convenient way to centrifuge multiple samples simultaneously while keeping tubes organized and secure. This product would be useful for any lab performing separations of biological or chemical samples.