Wilson Micrometer Adjustment Stop Add On Upgrade your standard Case Trimmer with a New Stainless long lasting finish with Micrometer adjustment Bolts on to your Regular Wilson Case Trimmer Larger stop screw adjustment from 3/8" (old) to 1/2" (new) with increased width on Stop Nut. Makes for a firm stop. Coated with black oxide for a long lasting durable finish. Major adjustment in the Stop Screw and fine adjustment by increments of .001 with the Micrometer Made in the U.S.A. with American Steel