Hex key Proline 48567 — 3 mm metric hex key, 1 pc

Proline 48567 is a single 3 mm metric hex key made for driving hexagonal socket fasteners. The one-piece tool offers a compact form factor for work in confined spaces and is suitable for tasks that require precise handling of small hex bolts and screws. The surface is polished chromium and the steel has been quenched and tempered to provide a balance of hardness and toughness for regular mechanical use.

Advantages

The polished chromium finish improves corrosion resistance and allows for easier cleaning after use. Quenched and tempered construction increases durability and resists deformation under torque. Its compact single-piece design provides reliable contact with 3 mm hex fasteners and enables access to recessed sockets where larger tools cannot reach.

Suitable for

• Precision assembly and fine mechanical work
• Electronics and small appliance repair
• Bicycle component adjustment and maintenance
• General household tasks involving small hex fasteners

Key specifications

• Size: 3 mm metric hex key
• Quantity: 1 piece
• Material treatment: quenched and tempered steel
• Finish: polished chromium
• Design: single-piece L-shaped hex key

How to use

Select the 3 mm hex key and insert the short or long arm into the hexagonal socket of the fastener depending on required reach and leverage. Apply steady torque, keeping the tool aligned with the fastener to avoid rounding the hex. For higher torque needs, use the long arm for increased leverage; for work in tight spaces, use the short arm to reduce clearance. After use, wipe the tool clean and store in a dry place to maintain the polished chromium surface.

Usage recommendations

Use the Proline 3 mm hex key only with matching 3 mm hex sockets to prevent fastener damage. Avoid applying excessive impact force; if a fastener is seized, apply appropriate penetrating lubricant and allow time before attempting removal. Regularly inspect the tool tip for wear and replace it if rounding or deformation is observed to ensure secure engagement and safe operation.