The Tom Kundig Collection includes cabinet pulls, rollers, door knockers and knobs. The knockers are nailed in pattern to the shaft. A central semicircular-arched doorway has cast-iron lion-head knockers. The doors usually possess brass or iron knockers. Her image also appears on door knockers to serve as a protective spirit. Old Bloody Bones inhabited Knockers Hole near the village of Baldhu. Like knockers or kobolds, bluecaps can also forewarn miners of cave-ins. Legendary creatures that appear in Cornish folklore include buccas, knockers, Giants and piskies. Legendary creatures that appear in Cornish folklore include buccas, knockers and piskies. Closely associated with tin mining in Cornwall are the subterranean ancestral knockers. There are a total of six knockers which strike six bamboo plates. The American interpretation of knockers seemed to be more ghostly than elvish. Both the lion-headed knockers, which do not align correctly, were also cast separately and soldered. By Minnesota statute, knockers must be at most diameter, long, and weight. Belief in the knockers in America remained well into the 20th century.