1/2" Dia, 5/8" LOC, 4" OAL M.A. Ford Square End Mill, manufacturer part number 13850012N.
Specifications: Cutting Diameter: 1/2 in (0.5000 in); Length of Cut: 5/8 in; Overall Length: 4.0000 in; Shank Diameter: 1/2 in; Number of Flutes: 3; Helix Angle: 36 degrees; Shank Type: Straight; Neck Length: 1-3/8 in; End Type: Square.
Material: Solid Carbide. Coating/Finish: Uncoated. Series: TuffCut X-AL. Unit of measure: Inch.