Machine description: DTH Class*, 3508 Cat Engine*, Single Pass Unit*, Currently using a 8” DTH Hammer with a 9” Bit, Equipped w/ ( 2 ) 6 ½” x 25 ft. Drill Pipe w/ 8” DTH Hammer, Dust Collector, Mast 73’ Long,, ... more info about the 2003 Driltech D55SP.