20 ALUM.  QUARTER TURN DZUS 7/16" DOME HEAD .450" . THE PICTURE SHOWS ONE BUT THERE WILL BE 20 .  SAME DAY SHIPPING DURING WORK WEEK &  PLEASE LEAVE FEEDBACK, AS I WILL PROMPTLY DO THE SAME FOR YOU.  ( THANKS FOR LOOKING.)   PLEASE CHECK MY OTHER ITEMS, AT MY STORE.