Irwin 63521zr 21/64 Inch 135 Degree Drill Bit 6 Pack

Product Description

The IRWIN 63521zr is a 21/64-inch twist drill bit sold in a bulk pack of 6. It features a 135-degree split-point tip geometry, which reduces walking on contact and eliminates the need for a center punch on most materials. An oxide finish provides surface hardness and basic corrosion resistance during storage and use. This bit is a standard jobber-length design intended for use in hand drills, drill presses, and other rotary equipment on job sites or in fabrication shops.

This drill bit is suited for drilling into mild steel, aluminum, wood, and similar materials encountered in general mechanical, HVAC, electrical, and plumbing trade work. The bulk pack of 6 makes it practical for service vans or shop stock where a common intermediate size like 21/64 inch sees frequent replacement. The jobber-length shank fits standard 3-jaw chucks used across most portable and benchtop drilling equipment.

Key Features

• 21/64-inch diameter for precise intermediate sizing between 5/16 and 11/32 inch
• 135-degree split-point tip reduces bit walking and improves hole entry accuracy
• Oxide finish adds surface hardness and basic corrosion protection
• Jobber length provides balance between reach and rigidity
• Bulk pack of 6 supports stocking for high-use trade applications

Compatibility

Designed as a standard jobber-length twist drill bit compatible with 3-jaw drill chucks in portable hand drills, drill presses, and rotary tools accepting a 21/64-inch shank.

Installation Notes

Secure the bit firmly in the chuck before operation and verify the chuck key is removed before starting the drill. Use appropriate cutting speed for the material being drilled — lower RPM for harder metals, higher RPM for softer materials like aluminum or wood. Wear appropriate eye protection per job-site safety requirements. Inspect each bit for wear or damage before use, as dull split-point tips can increase heat buildup and reduce hole quality.

Technical Specifications

• Diameter: 21/64 inch
• Tip Angle: 135 degrees
• Point Type: Split Point
• Finish: Oxide
• Length Type: Jobber Length
• Pack Quantity: 6

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: 63521zr