Powerful & highly efficient DEWALT PM47 fan-cooled motor with replaceable brushes delivers fast cutting action up to 3000 strokes per minute maximizing user productivity Intelligent variable speed trigger & lock-off switch for quick controlled cuts and enhanced work safety Tool-free adjustable shoe with anti-scratch cover bevels 45 degrees in both directions Quick and easy patented keyless blade change system accepts T-shank blades Patented anti-vibration counter-balance mechanism and rubber grip providing a smooth operation 3-position pendulum action controls the aggressiveness or smoothness of cuts Dust blower keeps line of cut clear of dust and debris Modular component design for trouble-free servicing Rubber coated grip to reduce surface vibration and user fatigue