Accusize Tools - 0-6" X 4" BASE DEPTH MICROMETERS, 5 key, 2025-4201 Interchangeable rods provide a wide measuring range Highly accurate interchangeable rods exclude the necessity of reset when rods are being changed Resolution: 0.001'' (Inch) Range: 0-6''. Base: 4'' No. of rods: 6 Clear microfine graduations .001&#034; on satin chrome finish. Base of tool steel hardened, precision ground and microlapped, all other surfaces satin chrome finished. Quick and easy zero adjustment. Rods hardened, ground and lapped on measuring surfaces and adjustable in either direction. Measuring range per rod is 1&#034; and .176&#034; in diameter. Interchangeable rods are fitted to the micrometer spindle against a positive stop and locked. Ratchet thimble for consistent repeated accuracy. Threads hardened, ground and lapped for accuracy. Meets or exceeds Federal accuracy specifications. Includes spanner wrench and fitted wooden case for storage. Base Length: 4&#034; Includes 6 rods for measurement of 0-6&#034; (0-150mm). Ideal for measuring the depth of small holes, small fabricated articles with grooved or elevated surfaces or difference depths or heights. Particular attention has been paid in obtaining the accuracy of the contact surfaces of the rod and its straightness. Interchangeable rods provide a wide measuring range. High accuracy interchangeable rods enable that reading does not have to be reset when changing rods. Base of tool steel hardened, precision ground and microlapped, all other surfaces satin chrome finished. Base Length: 4&#034; Resolution: 0.001&#034;. Range: 0-6&#034; Base: 4&#034; Number of rods: 6 Includes 6 rods for measurement of 0-6&#034; (0-150mm). Rods hardened, ground and lapped on measuring surfaces and adjustable in either direction.