The Temple Institute: In-Depth Temple Study: The Rings
 
The Rings: Uses

The rings were designed to assist in the slaughter of offerings. Each priestly watch used its designated ring for the slaughter of the offerings brought during their shift, with the exception of the Tamid offering, which was slaughtered daily using a specific ring. In the morning, the second ring on the northwest side was used and in the evening, the second ring on the northeast. 
Contents:   Part I,    Part II,    Part III,    Part IV,    Part V,    Part VI,    Part VII