Punisher skull is made of steel and comes with 1/2 split ring and 5/16" button head bolt and nylock nut 
Skull Measures 3" from the center of the 5/16" mount hole to the center of the ring hole - 3-3/8" H x 2-1/4" W total
This skull is the absolute best and coolest way to mount your Bell to your motorcycle 
Skull has an American flag that looks amazing  
Available with Kustom Cycle Parts Bell