Achla Designs Crackle Glass Birdbath Bowl with Stake, 12-in, Cobalt Blue Bowl measures 12 1/2-in diameter by 2 1/2-in D Crackled Cobalt Blue handblown glass, expect color variation Threaded Cradle and 36-in Stake included Roman Bronze powdercoated finish Winter protection for glass bowls is recommended. Do not allow water to freeze inside.