Porcelain lamp drop discs - 9x decorative pierced fittings

A group of nine small vintage porcelain discs, pierced with holes much like drainer plates. Intended to be used for multi drop light pendant fittings, they now make for decorative little display items.
Dimensions:
Approx 4.3cm diameter 
7mm thick
Condition:
Light wear and manufacturing marks but no damage.