The black and decker mthd5 multievo multi tool hammer attachment has a hammer action which allows you to drill into concrete or masonry it has 10 torque settings that are perfect for screwdriving into a variety of materials with different screw sizes it comes supplied with two masonry bits 8 and 10mm specification chuck 10mm two sleeve no load speed 0 4500 1450min with a 144 volt unit beats per minute 21750bpm with a 144 volt unit weight 07kg