When connecting two rudder or dive planes in the tight confines of the stern of your sub, a linkage horn links them together in a perfectly parallel manner, offering a strong connection that bypasses a central driveshaft. 
 
Manufactured from high strength ASA plastic with carbon fiber reinforcement, these units are available for shafts of either 1/16" of 1/8" diameter. 
 
Horns may be easily trimmed to accommodate more confined areas. 
 
Sold by the individual piece. Each package will include one yoke, two plated wheel collars and two stainless steel 4/40 set screws.