This is a two pack of ball mills from Carbide 3D that are perfect for milling curved surfaces. Each mill in this pack features a cutting and shank diameter of 0.25 inches and a cutting length of 0.75 inches. These cutters really are great for specialized 3D machining and fabrication. Each cutter is made of solid carbide to ensure long lasting use. Note: If you are using these cutters with a Nomad, you will also need a 0.25in collet. https://elecena.pl/product/15181845/ball-cutter-0-25-diameter-202-2-pack 2018-09-21 https://elecena.pl/product/15181845/ball-cutter-0-25-diameter-202-2-pack 2019-12-05