Mounting Bracket Set Cavity Width 0.8 in Cavity Height 0.4 in Height 0.5 in Outside Width 1.0 in Link to Link Pitch 0.51 in /13.0mm Mounting Brackets Included Yes Crossbar Material Plastic For Use With 2AAP6 2AAP7 2ACB3 2ACB4 Style Open Type Microtrack(TM) Mini Nylon Accessory Height 0.5 in Accessory Material Plastic Accessory Width 1.0 in