Designed to fit a Odyssey PC925 battery. Grommeted 3/8 ID holes for wires. Pre-drilled 3/8 pilot holes for mounting. 5/16 threaded inserts used for the 1/16 aluminum hold down bracket. The bottom has been reinforced. The origin of the box is unknown, it s a very solid box with a small latch and leather strap handle. $95, you pay for the ride.