The rotary hammer is a power tool with rotating accessory, which is suitable for drilling and chiselling in masonry, concrete and stone. In contrast to impact drills, rotary hammers are equipped with an integrated electropneumatic hammer mechanism that, unlike the impact drill, is not dependent on feed pressure applied by the user. For this reason, the impact energy of the rotary hammer is considerably higher in comparison, making it much easier to work on certain materials, especially concrete. Conventional rotary hammers weigh approximately two kilograms. However, they can weigh up to 27 kilograms, depending on the difficulty of the work.