Fixing Gun Nt50Ae2 HiKOKI Power Tool. Dual Function Trigger enables the user to easily switch between the safety and exactness of single fire shot over to the fast bump fire option. Tool-Less depth dial enables easy depth setting for flush, proud or deep driving applications. 360 Degrees adjustable exhaust enables exhaust to be directed away from user. Tool-less release enables rapid convenient clearing of jammed nails.