Eagle Cutting Tool S304-121-I Cobalt Jobber Drill Size 21

Product Description

The EAGLE CUTTING TOOL S304-121-I is a size 21 cobalt jobber-length drill bit built for drilling through hard and abrasion-resistant materials. Cobalt construction gives the bit higher heat resistance than standard high-speed steel, making it suitable for demanding applications where bit temperatures rise quickly. Jobber-length geometry provides a balance of reach and rigidity for general-purpose drilling in a wide range of materials. This type of bit is typically used by machinists, pipefitters, electricians, and plumbers who drill through harder stock on the job site or in the shop.

The S304-121-I is sized at drill number 21 and is appropriate for use in hand-held power drills, drill presses, and similar equipment. It is well suited for drilling through ferrous metals, stainless steel, cast iron, and other hard materials encountered in mechanical and trade work. The jobber-length design makes it compatible with standard three-jaw chucks commonly found in portable and benchtop drilling equipment.

Key Features

• Cobalt construction for improved heat resistance compared to standard HSS bits
• Jobber-length geometry balances reach and rigidity for general-purpose use
• Size 21 drill diameter for precise hole sizing in trade applications
• Compatible with standard three-jaw drill chucks
• Suitable for ferrous metals, stainless, and other hard materials

Compatibility

Designed as an OEM-style replacement or standard-use cobalt jobber drill bit for use in hand-held power drills and drill presses accepting standard three-jaw chucks.

Installation Notes

Install the bit securely in the chuck and verify it is fully seated before drilling. Always power down and disconnect or unplug the drill before changing bits. Use appropriate cutting fluid when drilling through hard metals to extend bit life and manage heat buildup. Follow applicable shop safety practices and wear eye protection during use.

Technical Specifications

• Drill Size: 21
• Drill Type: Jobber Length
• Material: Cobalt
• Weight: 0.4 pounds
• Minimum Order Quantity: 1

Standard Information

• Brand: EAGLE CUTTING TOOL
• Manufacturer Part Number: S304-121-I