Flex Arm Mag Base features:Corrosion resistant chrome plated flex arm85 lb. pull magnetHolds rigidly in almost any position.V-base for mounting on rounded surfaces.Magnetic Indicator Back features:Use for positioning the indicator on most metal surfaces.Protective coatingX-Proof Black Face Indicator features:Robust, shockproof designTravel: 1" Reading: 0.001" Continuous reading: 0-100Tolerance markersAGD Group 2, 2-1/4" dia.Lugback and carbide pointProtection includes:Rubber bellows on stemO-ring seal on safety capO-ring protection for bezel and rotating dialSealed back plate.