7005 aluminum alloy 6061 aluminum harder than 10% but more than a little crunchy, aluminum alloy 7005, unlike 6061, it does not require heat treatment to more costly to have enough hard currency, but in re used to increase the thickness of 7005 to reinforce the hardness, which explains the use of aluminum alloy heat treated 7005 is not low cost, but the increased weight (heavy).
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