Sirius Long Hexagon Allen Key Metric

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.