Skystone Bit for Reaming R32 , T38 , T45 , T51 , ST58 Reaming Button Bit
top hammer drill bits include thread connection of T38,T45,T51,T60,GT58,ST58,GT60,GT68 . the main diameter that is 64mm,76mm,89mm,102mm,115mm,127mm,146mm.(2.5inch,3inch,3.5inch,4inch,4.5inch,5inch,)