The Little Dandy Pistol Powder Measure is the perfect handheld powder measure for handloaders looking for a small and convenient volumetric powder measure for handloading pistols and select small-caliber rifles. This rotor knob makes it easier to charge cases. The Little Dandy Rotor Knob is easy to use! Just place over the end of the rotor and set the setscrew. This makes the rotor easier to turn and easier on your fingers. The Rotor knob is crafted from high-strength aluminum with knurled outer surfaces to give any handloader maximum finger-touch control. Not for use with Black Powder