Folding Shelf Bracket 16"x 9-5/64" Zinc Knape and Vogt 206 ZC 16

BEST ANSWER: The manufacturer does not state. Installation For maximum loading capacity, brackets should be mounted directly to wall studs, which are generally found on 16" centers. Prior to drilling all holes, check to be sure that the bracket is vertically level. Attach one bracket to wall stud by fastening one #10 x 2" screw through the top mounting hole in bracket. Use a level to position the second bracket at the same height as the first bracket and fasten it to a wall stud using one 2" screw through the top mounting hole. Center the shelf on the brackets. Fasten a #8 screw through rear most mounting hole on each bracket. Confirm that the shelf folds properly and adjust position of brackets if necessary. Finish securing the brackets to the wall by fastening #10 x 2" screws through the second top mounting hole and through one of two bottom mounting holes. Finish securing the brackets to the shelf by fastening #8 screws through the second rear mounting hole and through one of two front mounting holes