Wide-ringed wood is often called "second-growth", because the growth of the young timber in open stands after the old trees have been removed is more rapid than in trees in a closed forest, and in the manufacture of articles where strength is an important consideration such "second-growth" hardwood material is preferred. This is particularly the case in the choice of <answer>hickory</answer> for handles and spokes. Here not only strength, but toughness and resilience are important. The results of a series of tests on <answer>hickory</answer> by the U.S. Forest Service show that:
What specific kind of "second-growth" hardwood is often used to make handles and spokes? 
hickory