H855 Hydra drill bodies are designed to hold the interchangeable R950, R960 and R970 Hydra drill heads. They have an internal coolant system with coolant holes aligning perfectly with the interchangeable heads for efficient tooling. Several head diameters will fit exactly onto one size body, offering you a potential reduction in tooling needs, whilst common shank sizes allow for versatile tool holding. Changing a drill head is quick and easy, and can even be done without removing the body from the machine. H855 intermediate length Hydra drill bodies will give consistently high performance even after many head changes.