• Number size
• Number d
• Number gap

thorlabsRail = Rail(size = 30, d = 6, gap = 0.2);

CubeSize cubeSize [ defaultCubeSize ] Rail rail [ thorlabsRail ]

CubeSize cubeSize [ defaultCubeSize ] Rail rail [ thorlabsRail ]

Both parts can be used as modifiers for any uFace. For example,

muRailFaceT(){
    uApertureFaceP();
}

would add rail clamps to uApertureFaceP.