They were .45 caliber percussion revolvers, and could therefore be loaded with bullets made in the field. Kerr was a cousin of Adams, and carried on making the revolvers after Adams withdrew to form his own company in Birmingham.
They were a rare double action design, as were a few REmingtons.

These pistols performed very well in action, and were used extensively by the British in the Zulu War, and other frontier skirmishes.