Uxeter Kimberwick Bit. Kimberwick Horse Bits from 4 1/2 to 7 Inch. The Kimberwick bit is used in Spanish riding as well as Jumping. It's action can be strong and it is used with a curb chain which puts pressure on the bars with a leverage effect. All our Bits are High Quality German or Stainless Steel made by Coronet or Korsteel. Mouth Sizes 4.5, 4.75, 5, 5.25, 5.5, 6 and 7.