3/8 in, Neck Dia.
4-Flute PM+⢠HSS-E Square CC Double Finishing End Mill Cleveland PM-4DE Bright 1/4x3/8x5/8x3-3/8 Not Applicable Square End Mill, 1/4 in Milling Dia.., Powdered Metal, Bright (Uncoated), Weldon Flat, Length of Cut 5/8 in, Overall Length 3 3/8 in, Shank Dia.