Source for roll out shelf?

Need a robust, low profile slide out shelf for a closet shelf to hold something heavy. Need to gain top access after it slides out. Picture a heavy metal box like a tool box to sit on a shelf with only 12 3/4 inch clearance and the box is slightly taller [with lid closed] than 10 inches. Weighs approx 18-25 pounds.
Just need a low profile shelf that attaches to a particle board shelf [that'll be a challenge, too] sit the box on it. When want access, simply slide/roll the box out from under the above shelf, open up, and gain access.
May have to attach a metal plate [right angle to also attach to wall?] to the particle board to make it strong, then attach a slide to the plate. Because with the shelf fully extended there will be a lot of cantilever force on that shelf board.
Where to find such items?
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On Thu, 12 Jul 2012 13:28:42 -0700 (PDT), Robert Macy

Check out www.leevalley.com www.rockler.com for various shelf brackets and drawer slides.
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Rev-A-Shelf has a lot of kitchen storage stuff and you'll probably find something that'll do. http://www.rev-a-shelf.com /
R
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