Graphite 55H313 19-Piece HSS-R Twist Drill Bit Set with Case, 1-10 mm, DIN 338, Black Oxide

In a busy metalworking shop, a technician reaches for the Graphite 55H313 drill bit set to bore precise holes in a steel bracket. This 19-piece set covers diameters from 1 mm to 10 mm in 0.5 mm increments, ensuring the right size is always at hand. The HSS-R (rolled high-speed steel) construction with black oxide finish delivers durability and heat resistance for everyday drilling in metal, plastic, and other materials.

Key specifications

• Drill bit type: HSS-R twist drill bits, DIN 338
• Number of pieces: 19 (sizes 1–10 mm in 0.5 mm steps)
• Material: High-speed steel (HSS), rolled, black oxide coated
• Point angle: 118° for general-purpose drilling
• Shank: Cylindrical, suitable for standard drill chucks
• Compatible materials: Metal, steel, cast iron, non-ferrous metals, plastics
• Storage: Durable plastic case for organization and transport

Why choose it

The Graphite 55H313 set offers a complete range of common drill sizes in one convenient case. The rolled HSS construction provides a good balance of hardness and toughness, while the black oxide finish reduces friction and improves chip flow. DIN 338 compliance ensures consistent geometry and performance. Whether you're drilling pilot holes or finishing to size, these bits deliver clean results across a variety of materials.

Ideal use cases

• Maintenance and repair tasks in workshops and garages
• Metal fabrication and light industrial drilling
• DIY projects involving steel, aluminum, or plastic
• Drilling with corded or cordless drills and drill presses

Good to know

For best results, use appropriate cutting fluid when drilling hard metals and reduce speed for larger diameters. The plastic case keeps bits organized and protected, with size markings for quick identification. This set is not intended for masonry or concrete; use dedicated masonry bits for those materials.