Specification Brand : Flex-Hone BulletPoint1 : [QUALITY]- Proudly Made in the USA. The FLEX-HONE improves firearm performance. BulletPoint2 : [IMPROVES THE FINISH]- The FLEX-HONE will produce a smooth and consistent finish improving emptying and reloading, reducing friction and wear. BulletPoint3 : [REMOVES BRASS SCARRING]- Reloads will enter more quickly and smoothly. BulletPoint4 : [CLEANING BENEFITS]- Efficiently removes oxidation and corrosion. BulletPoint5 : The hone size listed on the product is the bore it is intended to be used for (or slightly smaller bore will work) CoarsenessRating : 400 CompatibleMaterial1 : Mild Steel CompatibleMaterial2 : Stainless Steel CompatibleMaterial3 : Cast Iron ExternallyAssignedProductIdentifier1 : 843469100429 ExternallyAssignedProductIdentifier2 : 0843469100429 IncludedComponents : BC 7MM 400SC 1911 MAIN SPRING HOUSING ItemName : Brush Research 00909 Main Spring Housing Autopistol Flex-Hone, Silicon Carbide, 7mm Diameter, 400 Grit (Pack of 1) ItemPackageDimensions_Height : 2.794 centimeters ItemPackageDimensions_Length : 10.922 centimeters ItemPackageDimensions_Width : 2.794 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : flex-hones Manufacturer : Brush Research Manufacturing Material : Silicon Carbide MaximumRotationalSpeed : 1200 rpm ModelName : FLEX-HONE for Firearms ModelNumber : 00909 NumberOfItems : 1 NumberOfPieces : 1 PackageLevel : unit PartNumber : 00909 ProductDescription : 13" overall length, Tool good for cylinder clean-up. Not for final finish ProductSiteLaunchDate : 2013-06-15T08:00:01.000Z Size : 7 millimeters Style : 400 Grit SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1