Designed to Fit the Unique Shape of Optima® Marine Batteries Fits D27M and D31M Series Rugged Poly Tray with 8 Mounting Slots Poly Strap with Stainless Steel Buckle Resistant to UV and Corrosion USCG and ABYC Compliant Optima™ Battery Tray Dimensions Size Length (In) Width (In) Width (Out) Height D27M / D31M 13" 7" 8-1/8" 1" SKU Product Name Packaged NBH-31-SSC-OPT Battery Tray for Optima™ Batteries NBH-31-SSC-OPT-DP NBHIOPT-31 Battery Tray Insert Only Note: Standard Pack: Packaged- Shrink Film w/Label - 12/box