1. A Ring Spanners Set is designed to provide the user with a wide range of ring sizes, with each ring spanner having two sizes of the ring on its ends. 

2. This type of spanner completely surrounds the fastener (such as a nut or bolt) for enhanced grip when it is tightened/untightened.

3. Inside these rings, projected teeth are built with which six-sided nut bolts that can be easily gripped. 

4. Spanner sets typically consist of a selection of different spanner sizes, bought together as a single kit that offers users a full range of options and on-hand flexibility when tackling nuts and bolts of any size.