5/16" Dia, 1-1/4" LOC, 3" OAL M.A. Ford Square End Mill, manufacturer part number 13831257.
Specifications: Cutting Diameter: 5/16 in (0.3125 in); Length of Cut: 1-1/4 in; Overall Length: 3.0000 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: Uncoated. Series: TuffCut X-AL. Unit of measure: Inch.