AISI 0-1 Drill Rod standard fractional sizes including number and letter sizes AISI W-1 Drill Rod standard fractional sizes including number and letter sizes AISI A-2 Drill Rod standard fractional sizes a millimeter diameters AISI D-2 Drill Rod standard fractional sizes AISI 0-1 Drill Rod millimeter diameters AISI S-7 Drill Rod standard fractional sizes Heat Treat Information on all 5 grades of Drill Rod manufactured by Buffalo Precision