Natural finger nails.
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2,54 cm 3 barleycorns
There are an infinity of possible solutions. Here are some: 1 cm * 1 cm * 550 cm 10 cm * 10 cm * 5.5 cm 1 m * 1 m * 0.055 cm or 1 cm * 2 cm * 275 cm 1 cm * 20 cm * 27.5 cm
a staple pin
1 cm =10mm(millimetres)
A mustard seed