TJR® HSS-E M35 Cobalt Step Drill Bit Set, 3 Pcs, 2-fluted Spiral Grooved with 29 Step (4-32mm) Sizes Total for Faster Drilling in Stainless Steel, Alloy steel, Non-ferrous metals, Wood, Plastics

The TJR HSS-E M35 Cobalt Step Drill Set is an essential tool for anyone who works with tough materials like stainless steel, alloy steel, titanium, and more. Made from high-speed steel (HSS-E M35) with a cobalt alloy, these drill bits offer superior hardness, heat resistance, and durability. The addition of cobalt improves the toughness and wear resistance, making them ideal for high-speed drilling operations, especially when drilling under high loads and temperatures.

This set includes three drill bits with 29 sizes in total:

• 5-step drill (4, 6, 8, 10, 12 mm)
• 9-step drill (4, 6, 8, 10, 12, 14, 16, 18, 20 mm)
• 15-step drill (4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32 mm)

Each bit is designed with a two-flute spiral design that helps material particles escape more easily, leading to a cleaner drilling process and extending the service life of the bit. The 135-degree split point tip enhances cutting speed, reduces slipping, and increases wear resistance.

The drill bits also feature laser-engraved sizes on the flute, making it easy to identify the size you need, and the standard round chamfering design ensures the versatility of the set. These step drills are suitable for use on a wide range of materials, including wood, plastic, aluminum, PVC, fiberglass, and fine metal (with thickness ≤ 5mm).