The Starrett 440, 440M, 445, 445M Series Depth Micrometer features a combination ratchet and speeder, ring-type locknut, ratchet stop and locknut. 0-9″ Range, 2 1/2″ Base, 9 Rods, Ratchet Stop, Lock Nut, Case. The depths of holes, slots, shoulders and projections can be measured with these fine tools 2-1/2″ (63.5mm) base and 1/8″ (3.2mm) diameter measuring rods Combination ratchet and speeder for uniform pressure and quicker adjustment Ring-type knurled lock nut for quick and sure locking Made in USA
