With similar benefits to a Pelham --  due to the curb action -- the Korsteel Stainless Steel Cambridge Mouth Slotted Ring Kimblewick Bit features the versatile benefit of use with a single rein. Slotted, fixed cheek piece provides two alternative rein slots depending on how much strength you would like to use, and fixed cheek bits offer a stronger alternative to snaffle bits. Mouthpiece features a low port and some relief for your horse's tongue. 
Details
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Slotted cheek: To use bit as a snaffle, attach reins to the upper slot to increase tongue pressure; to use as a curb bit use the lower slot and curb chain to increase leverage. 
\nBenefits of a Kimblewick: English bit design employs a curb chain to leverage the bit as you ride.
\nCambridge Mouth: The Cambridge mouth has a low port that alleviates tongue pressure.
\nElegant look: Piece is made from hand-polished stainless steel and features a Dee Ring for a classic look.