Our Cobalt Hole Saws are designed for use by professional trades people and manufactured from premium quality materials. We use Bi-metal construction with 8% Cobalt for extreme strength, durability, and performance. Abracs Holesaws are manufactured with high-speed variable pitch teeth for fast and clean cutting and are suitable for use on a full range of materials. Each Holesaw comes individually packaged & contains full information on correct speeds, applications, fitting instructions and safety guidelines.