FenderWedge - Assortment Kit 144 Pcs. (36 Of Each Size)A powerful combination of a wedge and a protective stainless steel plate thin enough to accommodate most narrow spaces easily. When inserted, FenderWedge pre separates the teeth by a few tenths of a millimeter which aids in the final building of the contact point. FenderWedge also protects adjacent teeth during Class II preparation. In almost 2 3 of cases adjacent teeth are damaged during class II preparation. FenderWedge prevents such damage