Specifications: 1/2 inches Flutes: 4flutes Cutting Diameter: 1/2 inches = 0. 5 inch  Cutting Length: 1. 37 inch Shank Diameter: 0. 5 inch Full Length: 2. 95 inch 3/8 inches Flutes: 4 flutes Cutting Diameter: 3/8 inches = 0. 375 inch  Cutting Length: 0. 984 inch Shank Diameter: 0. 375 inch Full Length: 2. 559 inch 5/16 inches Flutes: 4 flutes Cutting Diameter: 5/16 inches = 0. 3125 inch  Cutting Length: 0. 86 inch Shank Diameter: 0. 3125 inch Full Length: 2. 36 inch 1/4 inches Flutes: 4 flutes Cutting Diameter: 1/4 inches =0. 25 inch Cutting Length: 0. 708 inch Shank Diameter: 0. 25 inch Full Length: 1. 968 inch 3/16 inches Flutes: 4 flutes Cutting Diameter: 3/16 inches = 0. 1875 inch Cutting Length: 0. 59 inch Shank Diameter: 0. 1875 inch Full Length: 1. 96 inch 1/8 inches Flutes: 4 flutes Cutting Diameter: 1/8 inches = 0. 125 inch Cutting Length: 0. 47 inch Shank Diameter: 0. 125 inch Full Length: 1. 96 inch