How do I measure a bit?

The width of a bit is measured between the rings. The rings of a bit must be assembled against the cheeks of the horse.
It is necessary to pay attention to the correct width of the bit, because a to narrow bit gives irritations to the corners of the mouth and a to wide bit can 'saw' through the mouth because of the extra length of the bit.
The thickness of the bit is measured approximately 1 cm from the rings.
A standard bit size for a horse does not exist, but the schedule below can be used as a guide.