3 PCs Professional Four Spiral Step Drill Bit Set & M35 Cobalt Industrial Cutter Kit

Streamline your metalworking and fabrication projects with this Professional 3-Piece Step Drill Bit Set. Engineered for maximum efficiency, these bits feature a specialized Four-Spiral Flute design that provides four distinct cutting edges for faster, smoother penetration compared to standard dual-flute bits. Forged from M35 Cobalt Steel, these bits are built to thrive in high-heat environments, making them the ultimate choice for drilling through stainless steel, copper alloys, and hardened metals. Whether you are installing electrical knockouts or performing automotive repairs, this kit delivers clean, deburred holes with surgical precision.

Core Utility & Performance Features

• Industrial M35 Cobalt Core: Forged from a 5% Cobalt HSS alloy, these bits are engineered to withstand temperatures up to 1,450°F. This military-grade construction offers up to 3X the lifespan of standard HSS bits, allowing for consistent performance in hardened steel and carbon fiber.

• Advanced Four-Spiral Flute Design: Equipped with four sharp cutting blades, these bits ensure swift, vibration-free drilling. The spiral geometry effectively evacuates chips and debris, reducing the risk of clogging and ensuring the bit stays cool during deep-bore tasks.

• 34 Precision Step Sizes: This 3-piece set covers a comprehensive range of diameters, including 1/8" to 1/2" (13 steps), 1/4" to 3/4" (9 steps), and 3/16" to 7/8" (12 steps). This "one-bit" solution eliminates the need to carry an entire index of individual drill bits.

• Quick-Release 1/4" Hex Shank: Features a standard hex shank designed for a secure, slip-free connection in impact drivers and quick-change chucks. The tapered edge design automatically deburrs the hole as you drill, leaving a smooth, professional finish.

• High-Visibility Size Markings: Each step is clearly laser-etched with its diameter, ensuring you reach the exact size required without guesswork, even in low-light job site conditions.

Technical Specifications

• Material: M35 Cobalt Steel Alloy (5% Cobalt)

• Flute Type: Four-Spiral High-Efficiency Flute

• Shank Type: 1/4-inch Hex Quick-Release

• Heat Resistance: Up to 1,450°F

• Step Diameters: 1/8" – 7/8" (Total 34 Sizes)

• Application: Stainless Steel, Aluminum, Copper, Hardened Steel, and Wood

• Storage: Impact-Resistant Organization Case included

Snagg It Tip

To get the absolute maximum life out of your M35 Cobalt bits, especially when drilling into stainless steel, always use a slow RPM and apply a small amount of cutting fluid or machine oil. This reduces friction and allows the four-spiral blades to "slice" through the metal rather than grinding against it. If you're working on a vertical surface, use a center punch to create a small dimple first—the hex shank and four-blade design will take over from there, ensuring the bit doesn't wander and your hole is perfectly centered. This kit is an essential for any service vehicle, effectively replacing dozens of traditional bits with just three versatile tools.