Makita Demolition Hammer 30mm Hex Size:Corded Adjustable chain oiling HP.BCS Adjustable chain oiling High producing 200L min and low 120L min & decreases the amount of vibration to operator's hands Variable Speed control dial enables user to match the speed to the application for greater versatility Constant speed control automatically applies additional power to the motor to maintain speed under load to complete the most challenging jobs Soft Start suppresses start up reaction for smoother start ups and better accuracy Automatic Brush Cut Off protects commutator from damage for longer tool life Electronic with Makita HM1307C Demolition Breaker 30mm Hex Shank Suppression of motor speed during no load Reduces vibration of tool body when idling