Twist drill bit Irwin 10502223 — 7 mm diameter, single piece

Irwin 10502223 is a single-piece 7 mm twist drill bit designed for general-purpose drilling with handheld drills and drill presses. The bit features a conventional two-flute spiral geometry that provides stable cutting action and straightforward chip evacuation for common materials. Its dimensions and compatibility with standard chucks make it suitable for precision hole making in routine workshop and on-site tasks.

Advantages

The single-piece construction reduces the number of failure points and maintains concentricity for consistent holes. The two-flute spiral design balances drilling speed and chip removal, helping to keep the cutting edge engaged. The 7 mm diameter is a common size for through-holes and dowel or fastener preparations. The bit’s triangle shank provides secure grip in compatible chucks and holders to reduce slippage during operation.

Suitable for

• General drilling in metal sheets and structural metal
• Drilling in wood for dowels, screws and fittings
• Plastic components and panels
• Light-duty stainless steel tasks with appropriate coolant
• Use with handheld drills and drill presses

Key specifications

• Type: twist drill bit with two-flute spiral geometry
• Diameter: 7 mm
• Overall length: 109 mm
• Shank style: triangle shank for improved grip
• Material suitability: metal, sheet metal, plastic, wood, stainless steel (use coolant)
• Quantity: single piece

How to use

Secure the 7 mm twist drill bit in the drill chuck or holder, ensuring the triangle shank seats correctly to prevent rotation. Select an appropriate drilling speed for the material: lower speeds for stainless steel, moderate speeds for other metals, and higher speeds for wood and plastics. Apply steady feed pressure and allow the bit to cut without excessive force. Withdraw periodically to clear chips when drilling deeper holes, and when drilling stainless steel use coolant to reduce heat and preserve cutting edge life.

Usage recommendations

For best results, match drill speed and feed to the material being drilled, use cutting fluid when working with stainless steel or other hard metals, and clamp workpieces securely. Replace the bit if wear or chipping is evident to maintain hole quality and to avoid damage to the workpiece or tool.