The Bosch PRO Robust Line HSS-Co Drill Bit Set is a 10-piece set of cobalt-reinforced twist drill bits designed specifically for drilling in stainless steel and other metals. Manufactured from high-speed steel blended with 5% cobalt (HSS-Co), these bits offer strong resistance to heat and wear — qualities that are essential when working with hard or abrasive metals. The precision ground construction ensures consistent cutting performance across repeated use. Each bit features a specially designed centring tip that allows you to start holes accurately without the bit wandering. This makes the set well suited to construction workers, fabricators, and installers who need reliable, repeatable results when drilling stainless steel fixings, brackets, or structural metalwork. The cylindrical shank is compatible with standard three-jaw drill chucks, making these bits straightforward to use with most corded and cordless drills. Diameters range from 1mm to 10mm, covering the most common sizes needed across a wide range of trade applications. Features and Benefits: • HSS-Co construction — high-speed steel with 5% cobalt for superior heat and wear resistance • Centring tip for accurate hole starts and reduced bit wander • Precision ground finish for clean, consistent cutting in stainless steel and hard metals • Cylindrical shank compatible with standard three-jaw drill chucks • 10-piece set covering 1mm to 10mm diameters for versatile on-site use • Stored in a Robust Line case for organised, protected transport Specifications: Diameters (mm): 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 Total lengths (mm): 34, 49, 61, 75, 86, 93, 109, 117, 125, 133 Working lengths (mm): 12, 24, 33, 43, 52, 57, 69, 75, 81, 87 Set dimensions: 156.5 x 107.0 x 23mm Net weight: 0.340kg Contents: 10-piece HSS-Co twist drill bit set — included diameters: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10mm