It is used to mount the string director to the locknut base from underneath, using these 2 little machine screws.

Length: 0.0000 in
Width: 0.0000 in
Height: 0.0000 in
Weight: 0.100 oz
Packaging: 0.0000 kg
Units in box: 1
Parts by Make/Model > Kahler Parts > Locknuts
Parts by Type > Locknuts and Stringlocks > Locknut and Stringlock Hardware