72″ Heavy 1/2″ Slots 1″ Double Slotted Standards Satin Zinc SS22/7 (Pack Of 10) Description: Universal surface-mounted slotted standards. 1/2″ slots on 1″ centers. Countersunk mounting screw holes are 9″ apart. One advantage of double slotted standards is when installed 24″ on center or 48″ on center, the the slots are off center allowing you to use a 24″ long or a 48″ long shelf, without the fear of shelf falling off bracket. Another benefit is that using double slotted standards is that you can easily stagger shelving or have shelves run on a single level.Specifications: Width1 1/4 in.Length72 in.Thickness3/32 in.FinishSatin ZincUPC Number818703009219Dimensions72 in. L x 1-1/4 in. W x 1/2 in. DCarton Dimensions72.75″L x 7.5″W x 1″H