Fairing arrows adapters kit with 10 mm hole, indispensable when mounting arrows not original on the hulls, they close the holes left open by the original indicators. A kit can be used to mount two arrows (you put a plate inside and outside of the hull). For other applications in addition to those in the list to compare the shape of the housing with the original one in the picture, on some models feature only the rear. Measure 40x37 mm.