Super precision bore gauge deep cylinder bore gageing to a depth of 10 inch affords the user the ability to measure out-of-round conditions and tapers of cylinders without the necessity of removing pistons - critical wear area of the cylinder can be reached with this gauge. Super precision up to 0.0005 inch at range from 2 inch to 6 inch features: Super precision deep bore gauge measures bore to 10 inch deep, range 2 inch to 6 inch diameter 0.0005 inch precision graduations includes gage and interchangeable contact points dial indicator contains jeweled bearings, ABS storage case included.