Clamping kit for RSH Series Custom Mounts; The -C Clamp Option for RSH from Middle Atlantic is a special clamping mechanism designed for use with RSH series rack shelves. This unit helps keep your components securely in place and protect against vibrations and other unforeseen movement. It is intended for use in mobile applications or for protection against seismic damage, among other similar uses. This option consists of rubber-lined clamping bars, which are designed to maintain a tight grip without scratching your components. Simply add the suffix "-C" to any RSH shelf order to included this feature.