BatteryGuard™ acts like a shock absorber and can help extend the life of your expensive battery. Excessive shock and vibration are two of the leading causes for battery failure. Megaware BatteryGuard™ sits under your battery and absorbs the gravity shock caused by excessive vibration and up and down bounce. Can easily be cut to size for smaller applications. Reduces up to 80% of the G-shock Caused by Excessive Shock and VibrationGreat for Boats, Automobiles, ATVs, Trailers, RV's, or Anywhere Shock and Vibration Can Damage a BatteryDimensions: 12-3/4" x 6-7/8" x 3/8"Fits up to Group 31 Batteries