5/16" Dia, 1-1/8" LOC, 2-1/2" OAL M.A. Ford Square End Mill, manufacturer part number 13831255F.
Specifications: Cutting Diameter: 5/16 in (0.3125 in); Length of Cut: 1-1/8 in; Overall Length: 2-1/2 in; Shank Diameter: 5/16 in; Number of Flutes: 3; Helix Angle: 36 degrees; Shank Type: Straight; End Type: Square.
Material: Solid Carbide. Coating/Finish: Fordlube. Series: TuffCut X-AL. Unit of measure: Inch.