High hardness and stable performance - Made from heat-treated 40Cr alloy tool steel, this drill tool holder reaches hardness HRC52-55, providing durability and stability for heavy machining tasks. Comprehensive size options - Available in SHB20 12 mm variants, designed to meet a range of machining needs from intricate detail work to robust drilling operations. Precisely ground body for reliable performance - Carefully ground outer body delivers a smooth, precise surface for accurate, chatter-free cutting and improved overall efficiency. High concentricity for accuracy - Precisely ground inner sleeve bore ensures very high runout accuracy, minimizes runout, and yields precise results in every operation. Applications - Drilling and boring in steel and cast iron where tool life and stability are critical. - Precision drilling of automotive housings and machinery components requiring tight tolerances and smooth finishes. - Fine detail drilling on aluminum and alloy workpieces where stability and low runout improve results.