This Sirius Long Hexagon Allen Key is sized at 2.5mm, a commonly specified metric size used in precision machinery, small appliances, and bicycle components such as stem bolts and brake adjusters. It strikes a useful balance between fine precision and practical usability. Constructed from alloy steel, this key provides the toughness needed for repeated professional use. The long arm extends your reach and allows greater torque application compared to standard-arm keys, reducing hand fatigue during extended tasks. Features and Benefits: • Alloy steel build for strength and resistance to deformation • Long arm design improves leverage and access to deep-set fasteners • 2.5mm metric size ideal for bicycle maintenance and precision machinery • Reduces hand fatigue through better leverage • Suitable for professional and workshop environments Specifications: Size: 2.5mm Arm Length: Long Hexagon Type: Metric

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