It is what is removed when you need to replace the string hook and levers.

Length: 0.0000 in
Width: 0.0000 in
Height: 0.0000 in
Weight: 2.000 oz
Packaging: 0.0000 kg
Units in box: 1
Parts by Make/Model > Kahler Parts > 33xx Pro Bridge - No Route
Parts by Make/Model > Kahler Parts > 7330 Hybrid Bridge - No Route