The crank noseband
The crank noseband, which is also called a cinchback or doubleback, is designed to be fastened snugly around the horse’s nose, without a buckle to dig into the back of the horse’s jaw. This style of noseband can be used with any type of bit.
Action: Helps prevent a horse from opening/crossing his jaw when you can’t use a noseband which fastens below the bit and is popular with dressage riders who use double bridles. Some people don’t like it because some riders over tighten it to prevent the horse from opening the mouth at all. Can cause calluses if it is repeatedly fastened too tight.
Fitting:Similar to the cavesson, but fitted more snuggly. It shouldn’t touch the protruding cheek bones, nor should the skin be pinched when the contact on the bit is taken up by the rider.