Series 511 FEATURES: Interchangeable anvils and necessary accessories to perform close tolerance I.D. measurements. Carbide tipped contact point for durability. The dial indicator is fully protected by a rugged cover. Accuracy: 2µm/.00008". Gage Stem: 3/8". Supplied with 2923SB Dial Indicator (Dial Reading: 0-25-0, Range: .125", Graduation: .0005"). Optional extension rods can be attached for measuring deep holes. MITUTOYO 1.4-2.5IN. .0005 DIAL BORE GAGE 511-742