The Eggbutt cheekpiece prevents pinching of the lips and gives a slightly more solid feel against the side of the face. It also prevents the bit being pulled through the mouth. The release is slower and also introduces some poll pressure.
The Colin Miles is a great schooling bit with a 55mm centerpiece creating greater tongue pressure and reducing bar pressure. The rings give the horse something to play with and help keep the horse’s attention on the bit.
This particular joint exerts more pressure than the Control Plate or Elliptical.
The Cherry Rollers roll in the horse’s mouth giving him something to play with and reducing the likelihood of the bit being held in the horse’s teeth. They are constructed tightly so there is no chance of pinching. When pulling on the reins, the rollers allow the bit to move along the bars of the horse’s jaws as opposed to rubbing.
Very useful for horses that:
Lose sensitivity over time
Lose concentration
Cross their jaws
 
BIT WIDTH
5 1/4" 135mm, 5 3/4" 145mm, 5" 125mm, 5 1/8" 130mm, 5 1/2" 140mm
BIT DIAMETER
B16