Dia-Compe front brake recessed nut for freestyle and road bikes.
This is the type nut needed for forks that have a recessed bolt hole so that the brake can be mounted flush (so that there is not a nut to interfere with freestyle tricks). This type of recessed nut is also used on other types of bikes.
This particular nut is NOS (New-Old Stock), made in Japan, part number 1213, and has the larger 12mm diameter head (the ones currently made in Taiwan have a 10mm head)
Size: M6 X 1.0 X 13mm
Head diameter: 12mm
Bulk packed so no retail packaging is included.