The readyrailstrade static rail kit for 1u systems including poweredge r210 r310 r410 and r415 provides tool less support for 4 post racks with square or unthreaded round mounting holes including all generations of dell racks it also supports tooled mounting in 4 post threaded racks and 2 post telco racks for added versatility the static rails support a wider variety of racks than the sliding rails but do not support serviceability in the rack and are thus not compatible with the cma