Battery Tray with Clamp for 27 Series Batteries Heavy duty Battery Tray for size #27 batteries. Includes screw down clamp and four 1/4"x1" PH screws with washers. Injection molded polypropylene construction.WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.