Sirius Long Hexagon Allen Key Metric

This Sirius Long Hexagon Allen Key is sized at 4mm, a highly versatile metric size frequently found in machinery, automotive components, and general engineering assemblies. Its mid-range size makes it one of the most commonly reached-for hex keys in any toolkit. Made from alloy steel, it is built to withstand repeated use without rounding or deforming. The long arm extends reach into deeper sockets and increases torque application, reducing effort when working with tighter fasteners.