Slight incisions, breaks, tears or indentations on the surface caused by abrasive friction. Screeds Usually a 2–by–4 inch (50MM by 100MM) piece of wood laid flat side down and attached to a concrete subfloor to provide a nailing surface for tongue–and–groove strip flooring or a wood subfloor.
Loss on the surface, which may extend to the paint and ground layers caused by marking the surface with something sharp. Scratches Examples
Narrow, shallow, elongated, rough-edged depressions on the surface of a fashioned diamond, usually appearing as faint white lines under magnification.