The Bosch PRO Robust Line 13 Piece HSS-Co Drill Bit Set is a metal drill bit set designed for drilling stainless steel. It suits construction workers and installers who need long-lasting twist drill bits for stainless steel and other metals. Each bit is made from premium high-speed steel with 5% cobalt (HSS-Co) and ground for wear and heat resistance. A centring tip helps you start holes exactly where you need them, so the bits don't wander and you can drill clean, precise holes. The set covers 13 diameters from 1.5 mm to 6.5 mm in a single case. Cylindrical shanks fit standard three-jaw drill chucks, making the set a practical choice for pilot holes and general metal drilling on site or in the workshop. Features and Benefits: • HSS-Co construction with 5% cobalt for heat and wear resistance • Centring tip for accurate hole starting • Designed for long-life drilling in stainless steel and other metals • Cylindrical shank compatible with three-jaw drill chucks • 13 sizes from 1.5 mm to 6.5 mm Specifications: Net Weight: 0.219 kg Material: High-speed steel with 5% cobalt (HSS-Co) Diameter, mm: 1.5/2.0/2.5/3.0/3.2/3.5/4.0/4.5/4.8/5.0/5.5/6.0/6.5 Total length, mm: 40/49/57/61/65/70/75/80/86/86/93/93/101 Working length, mm: 18/24/30/33/36/39/43/47/52/52/57/57/63 Contents: PRO Robust Line HSS-Co metal drill bit set: 124 x 107 x 23 mm, 13 pcs Included diameters (mm): 1.5; 2; 2.5; 3; 3.2; 3.5; 4; 4.5; 4.8; 5; 5.5; 6; 6.5 Shank diameter equal to drill bit diameter