White Band Jobber Drill - for Cast Iron. A highly abrasive material with damping and thermal conductivity, high strength, and resistance to wear. Cast iron is used extensively for mass produced components. The White Band Series is designed for this specific purpose. TiAIN coating increases tool surface hardness to 87Rc. For machining materials with Hardness < 300 HB : Tensile Strength < 1000 N/mm