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Wooden or metal wedge - today made of plastic - usually with a concave top surface and a wooden handle or a metal bracket. The stop block is placed against the wheel of a vehicle to slow down or stop it.

Implements for the railways are made according to plan from oak or elm; the stem (approx. 90 cm), made of ash or acacia (1). [MOT]

(1) ''Kleine houten voorwerpen'': 3.