Picture is intended for reference. From L.E. Wilson website: Add power to your trimming with the power adapter. Designed to be used with a slow low powered hand drill. 7/16-20 TPI - Will fit all of L.E. Wilson Brand Cutters. Including 50 Cal and TiN cutters. **NOTE - Operate between 100 - 200 RPM, higher speeds can cause cutter to seize in cutter bearing. ** Keep cutter oiled when trimming