• Shank Type: Taper • Taper Size: NMTB50 • Blank Diameter (Decimal Inch): 3.88" Blank bars are suitable for all applications, including deep boring. While the tapers are ground and hardened, the projections are not. • Traverse ground shank to obtain optimum accuracy • Meets or exceeds ANSI specifications • Material to be machined - SNCM 415H