... Hole: 2 4.Body: Normal Rock Cutting Tools We are a manufacturer specializes in producing kinds of drilling tools includes taper chisel bits, cross bits ... , retrac button bits, extension rods, shank adapter, coupling sleeve, etc.All the products adopt the best alloy and high-intensity steel ... clients' need taper:4.8,6,7,11,12The diameter for taper:15,19,22,24,25(mm) Drill TypeBit diamater ...