Prodrill taper button bit as small hole bit is different with thread button bit as long hole bit to use taper match with bit with rod to be used for air leg or hand held jack hammer driller in quarrying,and mining. to match YT24, YT28, YT29a air pusher rock drills. such as Peru, Chile, Colombia etc. most of main size as follow :
Carbide code : T6 grade ( world No.1 ) Designed for underground mining to match YT24, YT28, YT29a air pusher rock drills in Peru, Chile, Colombia.