The dimensions stated are usage sizes that refer to the dimensions of the square edge.
Dimensions: No. 7: Shank diameter: 7.6 mm Shank length: 41.0 mm Suitable for 4.0 mm square drive
No. 11 Shank diameter:9.2 mm Shank length: 40.0 mm Suitable for 5.0 mm square drive
The wrench has a tapered square. The specified width is only reached on the inside. The photo is an example Image.
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