This is a package of split coupling sleeves. These are used to extend or coupling .093 (or 4-40) sized rods. This Package Includes: (4) coupling sleeves - This is basically a small piece of tubing with a slit down its length. These are installed by putting one rod halfway into the sleeve and then putting the other rod halfway in. The sleeve is then soldered (it wicks in along the split) to secure the rods. These are pre-tinned for easy soldering. JBN 6.16.94 *8)