Our Bit Converters from the Henri de Rivel line can easily be added to or removed from any double rein bit. Bit converters make a double reined bit such as a pelham usable with a single rein. Commonly used for riders learning to steady their hands before using double reins. The Henri de Rivel Bit Converters are part of the Henri de Rivel line of English saddles and bridles. The Henri de Rivel line of English tack is known for European design and quality at prices that offer great value.