A hammer-drill including: a housing having a motor including an output member; a rotary-reciprocatory output spindle journaled in the housing; a transmission disposed in the housing and driven by the output member, the transmission being operable to rotate the output spindle selectively at a first low speed or at a second high speed; a rotatably fixed hammer member and a rotatable hammer member each mounted around the output spindle, the rotatable hammer member cooperating with the rotatably fixed hammer member to deliver vibratory impacts to the output spindle in a hammer-drilling mode; and wherein the hammer-drill further comprises a mode collar rotatably mounted on the housing and around the output spindle, the mode collar being movable between a plurality of positions, each position selecting a different mode of operation, wherein the modes of operation comprise: a low speed mode wherein the output spindle is driven at the first low speed; a high speed mode wherein the output spindle is driven at the second high speed; and the hammer-drilling mode, wherein in the hammer-drilling mode the output spindle is driven at the second high speed; characterized in that the mode collar is coupled to an electronic switch that sends a signal to a controller to limit the speed of the motor, thereby providing the low speed mode when the mode collar is in the low speed mode position. a housing having a motor including an output member; a rotary-reciprocatory output spindle journaled in the housing; a transmission disposed in the housing and driven by the output member, the transmission being operable to rotate the output spindle selectively at a first low speed or at a second high speed; a rotatably fixed hammer member and a rotatable hammer member each mounted around the output spindle, the rotatable hammer member cooperating with the rotatably fixed hammer member to deliver vibratory impacts to the output spindle in a hammer-drilling mode; and wherein the hammer-drill further comprises a mode collar rotatably mounted on the housing and around the output spindle, the mode collar being movable between a plurality of positions, each position selecting a different mode of operation, wherein the modes of operation comprise: a low speed mode wherein the output spindle is driven at the first low speed; a high speed mode wherein the output spindle is driven at the second high speed; and the hammer-drilling mode, wherein in the hammer-drilling mode the output spindle is driven at the second high speed; characterized in that the mode collar is coupled to an electronic switch that sends a signal to a controller to limit the speed of the motor, thereby providing the low speed mode when the mode collar is in the low speed mode position. a low speed mode wherein the output spindle is driven at the first low speed; a high speed mode wherein the output spindle is driven at the second high speed; and the hammer-drilling mode, wherein in the hammer-drilling mode the output spindle is driven at the second high speed; characterized in that the mode collar is coupled to an electronic switch that sends a signal to a controller to limit the speed of the motor, thereby providing the low speed mode when the mode collar is in the low speed mode position.