RCBS Uniflow Powder Measure Small: . Large: 5-110 Grains of Ball, Flake or Extruded Powder There are two Micrometer Adjustment Screws available for the RCBS Uniflow Powder Measure which are Large Micrometer Adjustment Screw (Item# 654-966) fits RCBS Uniflow Powder Measure with a measuring Small Micrometer Adjustment Screw (Item# 322-221) fits RCBS Uniflow Powder Measure with a measuring