The Starrett S436.1 Outside Micrometer Set includes 25mm, 50mm and 75mm and 100mm micrometers, three standards, adjusting wrench, in case. The most popular precision micrometers used by skilled workmen worldwide. This model features 0-100mm measuring range. Combination ratchet and speeder for uniform pressure and quicker adjustment. Recommended for mechanics, automotive service and machine shops, toolrooms, inspection departments and wherever gaging involves a wide range of measurements.