4B leads for mechanical pencils.
Please be aware that the 4B and 6B grades of lead are very slightly wider than the 2B. Although they should fit most 5.6mm clutch pencils, like the Koh-I-Noor 5359, they are too wide for the Koh-I-Noor 5.6mm Automatic Pencil.
Diameter: 5.6 mm.
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