Xact edger all in one tool sharpens and bevels side edge, base edge and trims excess sidewall. Simply turn knob to clamp file, or pull and turn knob to adjust bevel angle. Patented adjustment feature provides simple and accurate bevel angles. Ceramic rollers minimize friction and allow filings to fall away from base. Angle options from 0 degree to 6 degree . Comfortable to use. Made of durable and impact resistent Lexan polycarbonate. Holds any length file or diamond for side edges and included file only for base edges. Includes high quality file blade for base and side edges and detailed instructions!(Download Xact instructions under 'Resources' in Tuning, Waxing and Base Prep blog.)