0-6" Depth Micrometer Set ~ 4" Base ~ 0.001" Graduation ~ Includes 6 rods. ~ Interchangeable rods are fitted to the micrometer spindle against a positive stop and locked. ~ Base surface hardened & lapped. ~ Ratchet stop for consistent and repetitive measurements. ~ SaTiN chrome non~glare finish. ~ Complete with fitted case and spanner wrench.