Allstar Performance Engine Cylinder Head Port and Polish Kit w/ Case. Kit includes: assortment of 60, 80 and 120 grit cartridge rolls 2 1/4 Mandrels For cleaning and modifying intake and exhaust ports to match gaskets, remove casting marks and for smoothing out runners. If for any reason you are not completely satisfied please communicate that to us, we will make it right. Powered by SixBit’s eCommerce Solution.