Cutting Diameter Description Series Page Depth .750 - 1.500 .50 12J1R 32 0° Lead End Mill .750 - 2.000 .63 12J1G 34 0° Lead End Mill 12J1G 1.000 - 1.250 .60 36 0° Lead End Mill (Top-On Style) .970 - 2.000 .66 12J1E, 12J4E 38 0° Lead End Mill 12J1E 1.000 - 1.250 .66 40 0° Lead End Mill (Top-On Style) 1.250 - 2.000 .59 1TJ1N 42 0° Lead End Mill 1TJ1N 1.250 - 1.500 .59 0° Lead End Mill (Top-On Style) 43 .750 - 1.500 .31 1SJ1Y 44 0° Lead End Mill .750 - 1.500 .31 1SJ1Y 46 0° Lead End Mill (Top-On Style) 1SJ1Y .750 - 1.000 .31 0° Lead End Mill (Chip Surfer Style) 47 11