Mounting Bracket Set Cavity Width 0.4 in Cavity Height 0.4 in Height 0.5 in Outside Width 0.6 in Link to Link Pitch 0.51 in /13.0mm Mounting Brackets Included Yes Crossbar Material Plastic For Use With 2AAP4 2AAP5 2ACB1 2ACB2 Style Open Type Microtrack(TM) Mini Nylon Accessory Height 0.5 in Accessory Material Plastic Accessory Width 0.6 in