AK50 is a hydraulic core drill tool designed for heavy duty drilling works for holes with diameters up to 70 cm, the tool is very robust and made with the best components and materials to assure an use simple reliable while giving the best performances. In order to give a wide range of speeds and drilling capacity on the tool can be installed six different hydraulic motor groups that include the ON/OFF valve, the quick couplers and the quick coupling motor / shaft. The motors are orbital type this means zero maintenance and a long lasting use without problems, only the 20cc motor is gear type. The motor groups can be changed in few seconds just loosing two screws and are equipped with a pressure relief valve that protects when tool is connected to the circuit of a machine with an excess of pressure. AK50 does not require maintenance and will assure long lasting service without problems. AVAILABLE IN UNDERWATER VERSION.