When using a snaffle bit, the bit should be selected so that there is a maximum of 3 to 5 mm of space on each side between the bit ring and the corner of the mouth. The side pieces of the bit should fit snugly against the corner of the mouth without constricting it.
The 2-finger test is a good way to check whether the bit is the right size. You can find further details in our 4-step leaflet.
