Pre-assembled to reduce on-site installation cost, our ‘Snap-on’ CJxxCAT40 series provides all the features listed for Legrand's CJ Series J-hook line. Fit all depths/widths wire mesh trays. EZ finish standard. Safe Working Load: 17 lbs. Requires no special attachment hardware or tools. Not recommended on center-hung style systems. Offered for the CJ12, CJ21, & CJ32 series J-hooks (CJ12CAT40, CJ21CAT40, & CJ32CAT40).