A Dutch Gag Snaffle bit is a very popular training bit. It provides a strong amount of measure and control with your horse. Usually with 4 rings, the top ring is for the cheek pieces to attach to and the 3 lower rings offer a variety of rein settings depending on how much control is required.

This Dutch Gag snaffle is Stainless Steel.
Snaffle Bit with 4 rings, a hollow mouth and french link for variable amounts of leverage.