The low frequency, high impact nature of the percussion cycle increases drilling efficiency in hard-to-penetrate rock. “The drill was designed taking advantage of my 30-plus years of experience designing rock drills,” said Ward Morrison, design engineering manager, J.H. Fletcher & Co. “This has allowed us to design a drill specifically for roof bolting that is even more simple, reliable and easy to use.” Fletcher offers the HV-32 on new roof bolters as well as retrofit kits.