This rating is for 1" jacking blocks. The geometry of the GM truck suspension is such that you get two inches of lift for every inch of leveling block. The thickness of the leveling block was half an inch. Mitutoyo's digital caliper block is actually measured at .473" thick, so a full 1" of travel is not available for these blocks. The description also states that the material is heat treated carbon steel. The blocks I received were cast iron or possibly cast steel.
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