50mm precision macro focusing rail with 20 TPI adjusting screw drive and indexable 4-position quick release clamp. 25mm micrometer adjusting macro rail featuring an ultra-precision Mitutoyo head with 0.001mm graduation increments and a 4-position quick release clamp. 25mm micrometer adjusting macro rail featuring a genuine Mitutoyo precision head, Delrin slider block, and 4-position quick release clamp.