Metal drill bits HSS-Ground DIN 338 Cobalt HSSGC 5.5 x 93

The Milwaukee Metal Drill HSS‑Co D338 5.5 mm is a professional‑grade drill bit set designed for precise and efficient drilling in high‑alloy steels and other tough metal materials. Built with cobalt‑enriched high‑speed steel (HSS‑Co), this drill bit offers superior hardness, heat resistance and durability for demanding metal‑working applications. The D338 geometry ensures clean entry and consistent performance. The 5.5 mm diameter size is ideal for general‑purpose metal drilling tasks where high strength and precision are required. Whether you are working with stainless steel, high‑tensile steels (over 1000 N/mm²), or other challenging metallic materials, this drill bit set provides the reliability and robustness expected from Milwaukee.

Features & Specifications

• Model / Type: HSS‑Co D338 series
• Diameter: 5.5 mm
• Material: Cobalt alloy high‑speed steel (HSS‑Co) — ideal for high‑alloy steels and metals with high tensile strength. 
• Geometry: D338 standard (DIN 338) twist drill format — robust design for metal drilling.
• Application: Suitable for drilling stainless steel, high‑tensile steels (1000 N/mm²+), and other metals.
• Length / Holding system: Cylindrical shank, total length approx. 93 mm.
• Key Benefit: Enhanced durability and heat resistance for metalworking tasks; high precision and reliability.