Hex key (Allen key) Proline 3 mm — 1 pc

The Proline 3 mm hex key is a single, metric Allen key designed for driving hex socket screws and bolts. Made from quenched and tempered steel with a polished chromium finish, this compact one-piece tool provides consistent fit and torque transfer for assembly, maintenance and repair tasks. Its small size and lightweight construction make it suitable for carrying in a toolkit, pocket or repair kit for both professional and home use.

Advantages

The hardened and tempered steel construction increases durability and wear resistance while the polished chromium finish reduces corrosion and facilitates cleaning. The one-piece design minimizes play between the tool and fastener, ensuring reliable engagement with hex sockets. The 3 mm metric size offers compatibility with a wide range of small fasteners encountered in furniture assembly, bicycle maintenance, and electronic devices.

Suitable for

• Furniture assembly and adjustment
• Bicycle component installation and adjustment
• Light machinery maintenance and small repairs
• Electronics and hobbyist projects requiring metric hex keys

Key specifications

• Tool type: single L-shaped hex key (Allen key)
• Size: 3 mm (metric)
• Material: quenched and tempered steel
• Surface finish: polished chromium
• Design: one-piece, solid construction
• Weight: compact and lightweight for easy portability

How to use

Select the 3 mm end that matches the hex socket of the screw or bolt. Insert the short or long arm into the socket to obtain the required leverage and turn clockwise to tighten or counterclockwise to loosen. Ensure full seating of the key in the fastener before applying torque to avoid rounding the socket. For higher torque needs, use the long arm as a lever; for confined spaces, use the short arm.

Usage recommendations

Inspect the hex key and fastener for damage before use. Store in a dry place to maintain the polished chromium finish and prevent corrosion. Avoid using excessive force beyond the tool's size rating to prevent deformation of the key or damage to the fastener.