The black 21357 Distance Rod with Pneumatic Spring from K&M is a steel tube combination used to connect satellite systems. It has 5 height adjustable positions, between 36.4 to 56.9". This rod features a redundant securing system, with a clamping screw and locking pin. The integrated 37.5 lb pneumatic spring is designed to ease the extension and retraction of the loudspeakers. The distance rod end is in the form of a peg, designed to make is easier to mount and remove the loudspeaker. M20 threaded bolts are used to attach the 24116 connector plate.