The BX-ZC826 series of Hammer drill is drived by petrol engine with hammer and impact drill functions. It can be transferred from high speed rotation to low speed rotation easily by the adjustable handle. There’s no need make any pressure when tool working, so u won’t feel tired if u use this tool for a long time. It’s very easy to fix the drills. It can make very precise hole on the rock, concrete, brick and other brittle materials. The petrol hammer drill is very portalbe and can used for the fixness of electric power, gas pipe, window and door without other accessories, wires, pipes. The hammer drill is indispensabl in remote working places without power.