The HIT370602 (also listed as part number 370602) is a genuine HiKOKI (formerly known as Hitachi Power Tools) OEM replacement hexagonal tool nut for a variety of 14.4V and 18V cordless driver drills and combi impact drills, including the following models :
DS18DBSL
DS18DBFL2
DV18DBFL2
DV18DBSL
DS14DBSL