Hex Key Set Bondhus BO20199 – 22-piece (9 Metric 10999 + 13 Inch 10937) Allen Keys

Bondhus BO20199 is a 22-piece hex key set that combines two complementary series to cover both metric and inch (imperial) internal-hex fasteners. The set includes nine metric keys and thirteen inch keys, providing a broad range of sizes for assembly, maintenance and repair tasks in professional workshops, industrial settings and home garages. The tools are designed to fit standard hex socket screws and bolts commonly found in machinery, furniture, electronics and automotive applications.

Advantages

The set offers a comprehensive selection of sizes in one compact kit, reducing the need to purchase separate metric and inch tool sets. Precision-formed hex keys ensure accurate fit in sockets to minimise rounding and fastener damage. Durable material and a consistent heat-treatment process provide strength and wear resistance for repeated use. The combination of short and long arm lengths gives access flexibility for confined spaces and greater leverage when needed.

Suitable for

• Assembly and disassembly of furniture and fixtures
• Maintenance and repair of bicycles, motorcycles and small engines
• Industrial and workshop tasks requiring both metric and imperial fasteners
• Electronics and appliance servicing where internal-hex screws are used

Key specifications

• Number of pieces: 22 (nine metric keys + thirteen inch keys)
• Metric sizes: a range covering common metric internal-hex fasteners (included set: series with nine metric keys)
• Inch sizes: a range covering common inch/imperial internal-hex fasteners (included set: series with thirteen inch keys)
• Hex key type: L-shaped Allen/hex keys with short and long arms for access and leverage
• Material and finish: heat-treated steel for strength and wear resistance (factory-processed finish)

How to use

Select the hex key that matches the internal hex size of the fastener to obtain a snug fit. Insert the short or long arm into the fastener recess depending on available clearance and required leverage. Turn the tool steadily to tighten or loosen the fastener, applying controlled force to avoid stripping. For hard-to-reach fasteners use the long arm as a handle to reach deeper sockets; for higher torque use the short arm inserted into the fastener and the long arm for leverage.

Usage recommendations

Inspect the hex key and fastener before use to ensure correct size and proper condition. Use clean, undamaged tools and avoid excessive force that could deform the fastener or tool. Store the set in its kit to keep sizes organised and protect the tools from corrosion and loss.