... tools(Tapered Drill Steel)Including:Drill rods with Shank H22x108mm,(6,7,11,12 degree taper) ... T51, bit diametre:45mm-127mm);Couplings sleeves-manufactured with a middle stop to prevent walking along the ... ,R32,R38,T38,T45,T51)Shank adapters-carburized and manufactured with tight tolerances and controlled straightness ... for road milling machine and trenching machine. Shank dia:19.4mm,25mm,30mm,33mm,38mm, ...