DTH Hammers                 In September of 2009, Rock Hog introduced its new "HP" series DTH hammers. To say the least, the results have been absolutely rock shattering. In countless numbers of actual field test comparisons, in a wide array of rock formations, rock hog's "HP" DTH hammers have yet to be equaled. Each ROCK HOG'S "HP" DTH hammer is factory tested to ensure that you receive the same ROCK HOG product reliability that you have come to expect while adding improved performance to your drilling. DTH Hammer series Information 4" DTH Hammer Model 4.5" DTH "HP" Hammer Model 5" DTH "HP"Hammer Model 5.5" DTH "HP" Hammer Model 6" DTH "HP" Hammer Model 6.5" DTH "hp" Hammer Model 8 " Hammer Model H.P. Series Technical Information Special Hammers