Garrison and ship carriages differed from field mounts in that the cannon they supported were intended for use in permanent installations, whether aboard a naval man-of-war or in the emplacement of a fortress. Thus, the carriages were heavier and stockier than those of the mobile field pieces of the period. The wheels, consisting of two but more often four in number were solid and smaller in diameter, their purpose being to take the recoil after firing and to permit the hand-spikeman to make minor changes in direction.
The wheels are cast as solid integral parts of their carriages of cast alloy. Finished entirely in gun-metal black.