Step twist drill bit set AWTools 1077330 M2‑TiAlN, set of 4, sizes 4–12 mm and 4–20 mm

Set of four step twist drill bits AWTools 1077330 with M2 substrate and TiAlN coating is intended for progressive hole enlargement and fast deburring in metalworking and general fabrication. The set contains two stepped drill types that cover diameter ranges 4–12 mm and 4–20 mm, enabling a sequence of hole sizes with a single tool. These step drills are suitable for use in hand-held drills and drill presses and are optimized for cutting in steel, stainless steel, non-ferrous metals and coated sheets where a hard, wear-resistant coating and stable substrate extend tool life.

Advantages

The M2 high-speed steel core provides toughness and heat resistance while the TiAlN (titanium aluminum nitride) coating increases surface hardness and reduces friction, improving wear resistance and allowing higher cutting temperatures. The stepped geometry lets you enlarge holes without changing tools, reducing setup time and improving consistency of hole diameters. The set of four covers common workshop ranges, giving flexibility for different hole sizes and applications. Suitable for both manual and machine use, these bits maintain cutting performance when drilling through thin sheets and thicker plate within the specified ranges.

Suitable for

• Progressive hole enlargement in steel and stainless steel
• Drilling and deburring in sheet metal and aluminium
• Workshop and industrial drilling with hand-held and machine drills
• Creating stepped holes for fast sizing and chamfering

Key specifications

• Material substrate: M2 high-speed steel
• Surface coating: TiAlN (titanium aluminum nitride)
• Set composition: four step twist drill bits covering step ranges 4–12 mm and 4–20 mm
• Intended use: progressive drilling and deburring in metals and sheets
• Compatibility: suitable for use in hand-held drills and drill presses

How to use

Select the appropriate stepped bit for the target diameter range and secure it in the drill chuck. Use steady feed and moderate cutting speeds suitable for the workpiece material; higher speeds are possible due to the TiAlN coating but should be balanced with sufficient coolant or intermittent pecking on tougher materials. Clamp or support the workpiece to prevent movement, and start drilling at a controlled rate to establish the initial pilot portion before progressing through the larger steps. Retract periodically to clear chips and, when drilling stainless steel or thicker material, use cutting fluid to reduce heat buildup.

Usage recommendations

For best results, match drill speed and feed to the material: lower speeds and higher lubrication for stainless steel, moderate speeds for mild steel and higher speeds for non-ferrous metals. Inspect cutting edges before use and replace bits when wear or chipping affects hole quality. When working with thin sheets, support the material to avoid deformation and use the stepped design to combine drilling and chamfering in one operation.