Yonico 31011-SC O-Flute Up Cut Solid Carbide CNC Router Bit, 1/8 x 1/2 x 1/4 x 2" Used For: Aluminum Cutting Diameter: 1/8" Cutting Length: 1/2" Shank Diameter: 1/4" Overall Length: 2" Premium Quality Carbide Industrial CNC Router Bit Satisfaction Guaranteed & Lifetime Warranty