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The curb chain applies pressure to the curb groove under a horse's chin when the curb rein of the bit is used. When the curb rein is pulled, the shank of the bit rotates back towards the chest of the horse and the cheek (upper shank) of the bit rotates forward (since it is a lever arm).f used with a loose curb chain, it allows the shanks to rotate more before the curb chain is tight enough to act as a fulcrum and exert pressure. This extra rotation can warn the horse before pressure is exerted on his mouth, so he may respond beforehand.
1 It has rein guides and a girth that wraps around the horse's belly to hold it in place. 2  Also on the saddle are shaft tugs to hold the shafts of the cart. 3  The breast collar is a flat piece of leather attached to the traces. 4  It lays flat against the horse's chest and allows the horse to pull the carriage or implement.