JR Race Car's polished aluminum weight tank is only 9-1/4"" long. And will hold Approximately 12.5 lbs. of lead shot weight. Depending on the amount of lead shot added as to how much the weight can will weigh. Clamps size range from 5/8" to 1-1/4 ". A great way to add weight where you want it! Tube size is 2-3/4" diameter, 9-1/4" inches long.