For 4-barrel projection systemDimensions measure 5" diameter and 3/4" highProvides additional clearance for mounting aftermarket air cleaners on cars, trucks, and RVsProvides air cleaner volume and ram effect for increased performanceCan be stacked or cut for desired heightThis air cleaner spacer provides additional clearance for mounting aftermarket air cleaners on cars, trucks, and RVs with smog systems, distributors, and accessory brackets. It also provides additional air cleaner volume and ram effect for increased performance. It can be stacked or cut for desired height and has a diameter of 5" with a height of 3/4". It works with standard 4-barrel projection spacers.