Kimberwick Bit SS with Double Jointed Solid Copper Lozenge Mouth and SS curb chain is a really versatile bit that blends features from both curb and snaffle bits, giving riders a variety of control options. It has a D-shaped ring with slotted holes, which lets you attach the reins at different points to adjust the leverage and pressure you apply.
Rowland SS Kimblewick Carriage Driving Bit with Mullen Mouth and Curb Chain with a D-ring/ Uxeter cheek piece, offering minimal leverage and is often used for driving or ridden work.