The Bosch PRO 19 Piece HSS-Co Drill Bit Set is a professional-grade metal drill bit set engineered specifically for drilling in stainless steel and other hard metals. Manufactured from high-speed steel blended with 5% cobalt (HSS-Co), these twist drill bits offer outstanding resistance to heat and wear — making them a reliable choice for construction workers, metal fabricators, and installers who demand consistent performance. The ground finish further enhances durability and cutting precision across repeated use. Each bit features a centring tip that allows you to start holes exactly where needed, reducing wander and improving accuracy. This is particularly valuable when working with stainless steel, where maintaining hole position is critical to a clean finish. The cylindrical shank ensures compatibility with standard three-jaw drill chucks. The set covers 19 diameters from 1mm to 10mm in 0.5mm increments, making it a versatile option for a wide range of metalworking tasks. Bits conform to DIN 338, and the set is supplied in a ProBox case for organised storage and easy access on site. Features and Benefits: • HSS-Co construction — high-speed steel with 5% cobalt for superior heat and wear resistance • Centring tip for accurate hole starts, reducing bit wander on metal surfaces • Ground finish for enhanced cutting performance and extended bit life • 19-piece set covering 1mm to 10mm in 0.5mm increments • Cylindrical shank compatible with standard three-jaw drill chucks • Conforms to DIN 338 standard • Supplied in a ProBox case for site-ready storage Specifications: Diameter range: 1mm – 10mm (19 pieces in 0.5mm increments) Net weight: 0.448kg Set dimensions: 172 x 115 x 42mm Contents: 19-piece HSS-Co metal drill bit set (DIN 338 cobalt alloy) Included diameters (mm): 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10 Included working lengths (mm): 12, 18, 24, 30, 33, 39, 43, 47, 52, 57, 57, 63, 69, 69, 75, 75, 81, 81, 87 Included total lengths (mm): 34, 40, 49, 57, 61, 70, 75, 80, 86, 93, 93, 101, 109, 109, 117, 117, 125, 125, 133