This high quality ball link offers smooth, secure operation with less slop. You"d want to use this on any control surface where accuracy is required (like the throttle linkage). * Includes: 1- swivel ball link (Black plastic, self-threading for 4-40 rod, 1" in overall length) with a burnished brass ball pre-installed with a #2 hole in it 1- 2-56 x 1/2" socket cap screw 1- brass spacer 1- 2-56 steel nut * Requires: 4-40 threaded pushrod 5/64" allen wrench for tightening screw (BONR1015) NMH 6-16-94