Using a drilling rig worth hundreds of thousands of dollars to pre-drill foundation piles can waste valuable production time. The K1 Drill Mast uses high power DTH hammers for pre-drilling hard rock, increasing your production speeds. Available for excavators and skid steers in 12-, 15- and 20-foot stroke units for pre-drilling up to 10-inch OD. With options to suit various applications. Pre-drilling power built to last.