Heavy-Duty Battery Tray – 29/31 Battery Series This heavy-duty Attwood battery tray is for a group 29 or group 31 battery and is made of non-corrosive black plastic. Features: Includes an adjustable-height crossbar and stainless steel retaining bolts Meets ABYC Standard E-10 and U.S. Coast Guard requirements Install with #10 fasteners Specifications: Inside Dimensions (L [...]