STEAM OXIDE COATED FINISH; 3 MM (VB1), 12.5 MM (VB2), 6 MM (VB3) MIN. DRILL SIZE; 12.5 MM (VB1), 25 MM (VB2), 19 MM (VB3) MAX. DRILL SIZE; 3 SIZE(S); CHUCK SIZE 6 MM (VB1), 10 MM (VB2/VB3)