This is the common #9552 Schaller/ Floyd Rose wood insert that matches up with Schaller/ Floyd Rose post #9654. This is sold as an individual wood insert in case you only need 1. You usually buy 2 inserts and 2 posts at a time. 

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 > Floyd Rose Tremolo Parts
Parts by Type > Mounting Hardware