Chassis support brackets are a simple way to support heavy equipment within the rack and facilitates ventilation of high heat-generating equipment.. Compatible with the following racks when used with Z-rail or Z-rail adapter: MRK, VRK, VMRK. Allows equipment to be placed into the rack without attaching the rack screws - ideal for fast swap outs NOTE: These chassis support angles must be attached to the Z-Rail or to a Z-Rail adapter. These brackets are not compatible with standard L-shaped rack rail without certain hardware or rack rail adjustments. Simple, effective support for heavy equipment without using rack screws. Note: Must be attached to Z-rail; not compatible with standard rack rail. Note: Compatible with MRK, VRK, VMRK, and WMRK racks only. Sold in pairs.Chassis support brackets are a simple way to support heavy equipment within the rack and facilitates ventilation of high heat-generating equipment.. Compatible with the following racks when used with Z-rail or Z-rail adapter: MRK, VRK, VMRK. Allows equipment to be placed into the rack without attaching the rack screws - ideal for fast swap outs NOTE: These chassis support angles must be attached to the Z-Rail or to a Z-Rail adapter. These brackets are not compatible with standard L-shaped rack rail without certain hardware or rack rail adjustments. Simple, effective support for heavy equipment without using rack screws. Note: Must be attached to Z-rail; not compatible with standard rack rail. Note: Compatible with MRK, VRK, VMRK, and WMRK racks only. Sold in pairs.