The Sequel Slotted Spine is designed to be used with the Model 176 Mounting Angle and many Sequel Racks to make a "Box Rack Assembly".
Simply bolt the Rack to the appropriate length Mounting Angle. Use 1" bolts to attach each end of the angle to a slotted spine. The slots allow each Mounting Angle/Rack assembly to be easily adjusted up or down to accommodate the part.