Example of slow speed rotary stainless steel instruments:: (A) GG drill and Peeso reamer, (B) Nickel-titanium rotary instruments, (C) Reciprocating handpiece, (D) Vertical stroke handpiece
Answer is A. Rotary Endodontic instrument used with a Handpiece 
They can be further subdivided into:

Slow-speed rotary stainless steel instruments  eg. Gates gliden drill, peeso reamer
Nickel-titanium rotary instrument.

Textbook of Endodontics Nisha GARG 3rd ED