Price reduced. This is a Pearl "ADP-20" adapter used in drum setups. Purpose: This adapter is used in drum setups to attach toms, cymbals, percussion instruments, etc., to stands and holders. Features: It has two open/close clamps that accommodate pipes with diameters from 15.9mm to 28.6mm. This makes it easy to attach to stands and holders. Manufacturer: A Japanese musical instrument manufacturer.