Long Series E430T.
Used for profile milling and producing open slots. Bright finish. Flute type: 30° helix. Manufactured to BS 122 : Part 4 : 1980.
Inch Tolerances:
Diameter: up to 1/2". Tolerance: +0.0025, 0.0005.
Diameter: Over 1/2". Tolerance: +0.0050, 0.0000.