Gem Bids For 97 Solid Carbide Boring Bar Dia. 12mm Left Hand Through Coolant Overall Length Mini. 170mm Iso Turning Insert For Boring Bar Dia. 12mm Mini. 3 Cutting Edges Suitable For Upto 35hrc Steel Insert Screw For Boring Bar Dia. 12mm Keyspanner For Insert Screw Of Boring Bar Dia. 12mm