First cut with our new i2R White B.24. Bits Used with Feeds and Speeds: 1/4" 60 Degree Vbit (Bits and Bits): S = 24000, F = 18002000 .375" Down Cut End Mill (Bits and Bits): S = 24000, F = 1900 1.5" Surfacing Bit (Amana): S = 1900021000, F = 1700