Multi-diameter drills for drilling and deburring sheet materials in a single operation. * No pilot holes or centre punch required * Each step gives a different hole diameter * High speed steel * Titanium coated for durability * Sizes 4 to 12mm, 4 to 20mm and 4 to 32mm * Steps in 2mm increments * Sizes 4 to 22mm in 2mm steps * Supplied as a set of 3 * Rolson type 48890