Thanks for your question. Regarding attaching the casters to this 4 Shelf Chrome Plated Shelving Unit, the casters push in and then turn. This should catch and compress the rubber boot and lock the caster into place.
Thanks for your question. The shipping weight of this 18" x 48" 4 Shelf Chrome Plated Shelving Unit is just under 65 lbs (64.63).
Each shelf up to 48" in length is rated to support up to 800 lbs. of uniformly distributed weight.
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