Carmex Deep Reach Mill Thread Holder - For Carbide External/Internal Threading Inserts - SR0025D21-1SMeet the Carmex Deep Reach Mill Thread Holder SR0025D21 1S a precision tool holder designed for CNC milling threading tasks using carbide inserts. Built for shops and engineers performing high speed thread milling with helical interpolation, it delivers deep reach with a stable, repeatable interface. Two threading insert system: Uses two carbide threading inserts to boost productivity and shorten threading cycle times on milling operations. Internal