28mm rock drill bits

Excellent Material 28mm 7 Degree 5 Button Bit 38mm Rock Drill Bits 34mm 8 Buttons 7 Degree Tapered Jack Hammer Bits General introduction: Rock Drilling Tools ProDrill, Taper button bit as small hole rock drill bits are different with thread button bit as long hole bit to use taper match with jack hammer bit with rod to be used for air leg or hand held jack hammer driller in quarrying, and mining. Product information: -Name:Tapered Button Bits for quarrying, mining, tunneling