Tiptop Audio Z-Rails are mounting rails for the Eurorack modular synthesizer format and are designed to be used for professional and DIY case mounting assemblies. Z-Rails are sold in sets of two (2) aluminum,silver or black anodized rails, each containing a Zinc plated metal threaded strip with 3mm threads at 5,08mm spacing. The rails are easy to install using Z-Ears or Z-Rail Brackets but can also be attached direct to any frame with just two M4 screws, one for each side of the individual Z-Rail. The M4 screws are not included as they are size dependent on the thickness of the material the rails will be attached to. M4 screws are included with Z-Ears and Z-Rails Brackets.