Two speed impact drills have two geared transmission that is why they are called two speed. This style of transmission is a big advantage over single speed impact drills. Usually they are heavier than their counterpart. They can be distinguished by a numbered gear switch on the side or top of the drill. The gear resembles the gear in cars , it means when you put in the first gear the drill turns slowly but produce a very high amount of torque. This amount of torque and the impact drill’s powerful motor, make it able to do jobs that is only recommended for drills with high torque. When the second gear is selected, revolutions per minute gets high but torque gets reduced. This makes the tool perfect for smaller holes in metal and wood. This setting is also suitable for average size masonry holes.