IronRidge slotted L-feet are engineered for roof mounting applications using the XR10, XR100 or XR1000 rails. Vertical slots allow for easily dropping in rails and provide adjustability to account for roof irregularities. IronRidge L-feet are manufactured using 6000 series (heavy-duty). **NOTE: Hardware is now sold separately. Choose between the Square Bonding hardware or the T-Bolt Bonding hardware.