Specification Brand : Starrett BulletPoint1 : Measures Accurately - The Small Hole Gages are ideal for accurately measuring small holes, slots, grooves, and recesses. This makes it perfect for general work where more accurate measurement is required. BulletPoint2 : Safe and Smooth Adjustment - It is designed with a smooth and sensitive adjustment that makes it easy to get the perfect fit. The adjustment range is also restricted by a safety stop, preventing breakage and damage. BulletPoint3 : Best Performance - These gages have a precision ground radius on each gage that provides two-point contact for maximum accuracy and a hardened-ball measuring the surface with two-point contact. It comes with a half-ball with a flat bottom. BulletPoint4 : Ergonomic Design - Manufactured from high-quality material to provide dependable service in the field or shop. It is designed to be convenient to use in close quarters and well balanced to ensure stability when used. BulletPoint5 : The Standard for Excellence - Proudly made in the USA, Starrett combines over 140 years of American heritage and innovation with globally sourced materials to deliver exceptional quality tools and products. ExternallyAssignedProductIdentifier1 : 049659530865 ExternallyAssignedProductIdentifier2 : 0049659530865 ExternallyAssignedProductIdentifier3 : 00049659530865 ItemName : Starrett Small Hole Gage with Smooth, Sensitive Adjustments and Half-Ball with a Flat Bottom - 400-.500" Range, 3-1/2" Length - 831D ItemPackageDimensions_Height : 1.778 centimeters ItemPackageDimensions_Length : 10.414 centimeters ItemPackageDimensions_Width : 3.048 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : hole-gauges Manufacturer : Starrett ModelNumber : 831D NumberOfItems : 1 PartNumber : 831D ProductSiteLaunchDate : 2010-07-30T00:00:01-00:00 Range : 0.400"-0.500" Size : Under 3 Inches SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1