A Kimberwick is a curb (leverage) bit. The further the reins slide down the D ring, the more leverage is applied. On the Uxeter Kimberwick the reins can be attached through the slots. The lower slot will have more curb action than the upper slot. The curb chain or straps prevents the bit from rotating too far in the horse’s mouth. When the reins are pulled back the bit applies pressure to the bars of the mouth, the chin and the poll. If there is a port, there may be pressure on the roof of the mouth.This is a bit commonly used in general riding and provides more aids to a horse that may be a strong puller or needs slight curb action to lower its head. It is quite common to see ponies wearing these bits.