3/8" Dia, 7/8" LOC, 2-1/2" OAL M.A. Ford Square End Mill, manufacturer part number 27737510B.
Specifications: Cutting Diameter: 3/8 in (0.3750 in); Length of Cut: 7/8 in; Overall Length: 2-1/2 in; Shank Diameter: 3/8 in; Number of Flutes: 4; Helix Angle: 38 degrees-41 degrees; Shank Type: Straight; End Type: Square.
Material: Solid Carbide. Coating/Finish: ALtima Blaze. Series: TuffCut XT. Unit of measure: Inch.