This Attwood Heavy-Duty Battery Tray reliably and securely holds a 29/31 Series battery. This heavy-duty, non-corrosive, black plastic tray comes with an adjustable-height crossbar and stainless steel retaining bolts. This tray is intended for use with 29/31 Series batteries. Its inside dimensions are 13 1/6 inches x 6 7/8 inches, and it installs with #10 fasteners. It meets ABYC Standard E-10 and USCG requirements, and was made in the USA. Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing the highest quality marine products for over 100 years. We deliver safe and reliable lighting, fuel systems, water systems, seating & pedestals, swim ladders, custom upholstery, and general marine accessories that are easy to install and meet regulatory compliance.