The Grant Instruments Stainless Steel Test Tube Racks are specifically designed to fit the SAP, JBN, JBA, and SBB series water baths produced by Grant Instruments. These racks are essential accessories for laboratories using these water baths for heating, incubation, or temperature control applications. They provide a secure and organized method for holding test tubes, vials, and similar laboratory glassware during various processes, ensuring optimal temperature regulation and preventing accidents or breakages.