General description An extra long hex key set designed for sizes ranging from 4 to 10mm, providing excellent access to deep-seated or hard-to-reach fixings, particularly in situations where extension bars cannot be utilized. Technical specifications Sizes: 4mm, 5mm, 6mm, 7mm, 8mm, 10mm Extra long length: 600mm Short head size range: 25mm - 40mm Material: S2 steel