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Here is the perfect product to install a keystone in the Beon Stone coating. Beon Stone Keystone is ideal for a superior finish.
Brown: Earth
Beige: Rialto, Oslo
Grey: Carbo, Grio, Grapho
Black: Basalt, Oxo
Dimension: 6.5" wide (bottom) x 10" high x 7.5" wide (bottom)