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These are my take on 16 in. Schoolhouse Light Globes in O scale. There are 24ea globes and 24ea caps. There is a guide hole in the center of the caps to guide whatever size drill you wish to use. The idea is that you can mount the globes flush with the ceiling or hanging from pipe. In either case you drill the cap to fit the leads from the LED and/or the pipe. The globes themselves are hollow.