1. Type of bit: You need the right type of bit for the right horse.
2. Right size of bit: You need to have the right size bit for the horse.
3. Style of bit: You need the right style of bit for different horses.
Bits and mouth pieces come in all different shapes and sizes. Two bits are D-Ring and O-Ring. Putting a bit in a horse's mouth is an easy thing to do if you've had practice.
Kylee J. Duberstein, Ph.D., Edward L. Johnson, Ph.D. "Bits 101." 01 01 2014. UGA Extension. 19 11 2015 <http://extension.uga.edu/publications/files/pdf/B%201379_5.PDF>.