Adapter used to attach compression driver tweeter to horn. Comes complete with rubber rings and mounting screws. 35mm internal screw thread diameter. Made from strong metal alloy that’s lightweight and able to hold the weight of heavy compression drivers. Mounting holes 55mm apart. Sold in pairs. Ask DJ City about all your speaker and parts needs. We stock a range of replacement compression drivers, bass drivers, piezo tweeters, adapters and more.