These forcing cone hones feature a 1-5/8" length abrasive and a 10" overall length. The 800 grit model features an aluminum oxide abrasive, while the 180 grit model is made from silicon carbide. Honing the forcing cone will result in smoother shot constriction with less barrel fouling. Notes:The manufacturer recommends the use of Flex-Hone oil for use with these hones. It is specially formulated for use with Flex-Hone hones