The Bosch PRO Robust Line 13 Piece HSS-Co Drill Bit Set is a professional-grade metal drill bit set designed specifically for drilling in stainless steel and other metals. Manufactured from high-speed steel blended with 5% cobalt (HSS-Co), these bits deliver excellent heat and wear resistance — essential when working with tough materials such as stainless steel. The cobalt content reinforces the cutting edge, helping the bits maintain performance through extended use on demanding jobs. Each bit features a precision centring tip that prevents wandering when starting a new hole, enabling accurate, clean results from the first contact. This makes them a practical choice for construction workers, installers, and contractors who need reliable, repeatable performance across a range of hole sizes. The set includes 13 bits covering diameters from 1.5mm to 6.5mm, all with a cylindrical shank compatible with standard three-jaw drill chucks. Presented in a compact Robust Line case, the set keeps bits organised and protected on site. Features and Benefits: • HSS-Co construction with 5% cobalt for improved heat and wear resistance • Precision centring tip for accurate hole starts and reduced bit wander • 13-piece set covering diameters from 1.5mm to 6.5mm • Cylindrical shank compatible with standard three-jaw drill chucks • Stored in a compact Robust Line case for on-site organisation Specifications: Net weight: 0.219kg Diameters (mm): 1.5, 2, 2.5, 3, 3.2, 3.5, 4, 4.5, 4.8, 5, 5.5, 6, 6.5 Total lengths (mm): 40, 49, 57, 61, 65, 70, 75, 80, 86, 86, 93, 93, 101 Working lengths (mm): 18, 24, 30, 33, 36, 39, 43, 47, 52, 52, 57, 57, 63 Case dimensions: 124 x 107 x 23mm Contents: Set description: 13-piece Robust Line metal drill bit set HSS-Co included diameters (mm): 1,5; 2; 2,5; 3; 3,2; 3,5; 4; 4,5; 4,8; 5; 5,5; 6; 6,5 included working lengths (mm): 18; 30; 30; 33; 36; 39; 43; 47; 52; 52; 57; 57; 63