The RCBS Little Dandy Rotor Knob was designed to be used with the RCBS Little Dandy Powder Measure. The RCBS Little Dandy Rotor Knob is an accessory knob that can be attached to any Little Dandy Powder Measure using a set screw which ensures a large gripping surface.In addition to having a large gripping surface the RCBS Little Dandy Rotor Knob features knurled edges. This accessory knob was made from high-strength aluminum to ensure a lifetime of quality performance.