Starrett 224MDRLZ 300 - 400 mm x 0.01 mm Mechanical outside micrometer - Interchangeable anvilStarrett satin chrome finish no glare resists rust. Advanced sleeve design with staggered lines and distinct figures for precise and easy readability. Large thimble diameter with distinct figures. Balanced frame and thimble design ensure easy handling and better readability Ring type knurled lock nut for quick and sure locking Combination ratchet and speeder for uniform pressure and quicker adjustment. Rigid and stable special cast iron frame with