It looks like an ordinary dial similar to those found on safes..."
Dialダイヤル ( daiyaru) is a key item that appears in .
Resident Evil 0
It fits onto the lock for the door in the basement which leads to Marcus' private rooms and the cable car station. The combination can be discovered from hints contained in the
journals of James Marcus, concerning the growth of the leeches.
The Dial can be found in the
Breeding room, which is located in the laboratory below the church. Two Hunters will be in this room, essentially guarding it. 
The Dial is located in room in the top-right corner
Hamamura, Koichi, ed (2003) (in Japanese). . Famitsu. ISBN biohazard 0 KAITAISHINSHO 4-7577-1298-7.
Sumner, Christian; Shotten, Brian; Owen, Michael, eds (9 November 2005). . Translated by Zpang America, Inc.. BradyGames. ISBN Resident Evil Archives: Umbrella's Virus Uncovered 0744006554.
Ōno, Tetsuya; Masui, Kō, eds (31 March 2005). . Famitsu. ISBN biohazard archives 4-906-582-31-1.
Excerpt from Archives , page 187: "A dial used to input numbers. Found in the back of the Animal Care room in the B1 laboratory. Thre are two Hunters waiting for prey when you go to get to it."
↑ Sumner, Shotten, Owen (eds).