Honing the mainspring housing of a 1911 significantly improves your ability to cock the hammer. It also reduces the metal on metal wear of the moving parts, and reduces corrosion because the treated surface is better able to hold oil and lubricant.Notes:The manufacturer recommends the use of Flex-HoneA(R) oil for use with these hones. It is specially formulated for use with Flex-HoneA(R) hones FeaturesTwisted steel wire shaftAbrasive globules on flexible nylon filaments400 Grit Material