OSTTE Cobalt Drill Bit Set 20-Piece (1/16"-1/2") | M35 Cobalt HSS TiN-Coated 3-Flute with 125° Split Point & 3-Flat Shank | Indexed Case

Premium performance for metalworking

The OSTTE Cobalt Drill Bit Set is designed to support metalworking tasks from light DIY to professional projects. Built from M35 cobalt high-speed steel with five percent cobalt, these bits offer enhanced heat resistance and longer life when drilling through steel, hardened metals, cast iron, and alloys. A durable TiN coating further reduces friction and wear, helping tools stay cooler and endure demanding cuts.

Three key features shape the drilling experience: a three-flute design for faster penetration and smoother operation; a 125° split point for self-centering and cleaner holes; and three spiral flutes for efficient chip removal and reduced clogging. Together, they help you maintain control across multiple passes and material types.

Key capabilities

• Three-flute design delivers faster penetration and smoother operation.
• 125° split point maximizes self-centering and hole cleanliness.
• TiN coating reduces friction for cooler operation and longer life.
• Three-flat shank minimizes spin-out in standard chucks for precise control.

What you get in the kit

• 20-piece assortment includes a range of sizes for metalworking tasks, with both 3-flute and 2-flute bits.
• Durable indexed storage case makes tool selection quick and organized.
• Note: 1/2 inch bits are slightly shorter than standard lengths, a useful detail for tight setups.

Real-world use ideas: switch between sizes to match the thickness of steel plate, cast iron, or alloy sections. The bits pair well with portable drills and drill presses, offering dependable tracking and steady drilling in tight spaces or thick materials. While results vary with material and setup, users often notice cleaner holes with reduced wandering and improved edge quality.

Care and storage

Keep the bits dry and clean after use, then store them in the included indexed case to protect the TiN coating and ensure fast, reliable selection for your next project.