Designed For Mounting5114 Or5116 Box Rail. Includes 2 Lag Bolts, Carriage Bolt And Nut. Suitable For Use On Corrugated Metal Siding Due To Narrow Mounting Surface. Galvanized Single Box Rail Brackets Adjustable, With Lags, Designed For Mounting National's #5114 Or #5116 Box Rail On Buildings With Corrugated Metal Sliding, Display Pac Loose.