- Achieve superior precision, speed, and quality when cutting aluminium on your cnc machine with the 3mm x 12mm Up-Cut Amana Tool 57302 Metric Aluminium Spiral End Router Bit (6mm Shank). Specifically designed for machining aluminium materials, these router bits ensure clean, accurate cuts while maximising efficiency. Perfect for carving and shaping aluminium with ease and reliability Amana Tool Amana Tool’s cnc machine router bits are crafted from premium sub-micron grain carbide, ensuring exceptional durability and precision. Utilising an advanced edge processing system, each router bit is finished with a mirror-like polish and a razor-sharp cutting edge. This meticulous process results in clean, precise cuts, minimal chip re-welding, an outstanding surface finish, and. most importantly. an extended tool life.