This Large Battery Box is adjustable and was designed to fit any Group 24, 27, 29, or 31 battery. Fits any battery length from 10-1/4″ to 13-3/4″. The perfect way to safely install your battery in a car, boat, camper, RV, or elsewhere. The sturdy box is impact resistant and will provide years of excellent protection for your battery and nearby surfaces. Provides excellent ventilation to release battery gases safely. Our Adjustable Battery Box is constructed of heavy duty polypropylene and is highly resistant to battery acid, oil, gasoline and other harsh chemicals. Includes a hold-down strap and a mounting hardware kit. Made in USA at our factory in Ohio.