5/16" bit works great with Rocky Mountain Climbing Gear climbing holds. I bought a set of 50 hooks linked below and after hand tightening 30 of them with the supplied Allen wrench I figured I needed some to use my drill bit. Worth every penny! Especially if you decide to reconfigure your climbing wall. http://smile.amazon.com/50-Bolt-Climbing-Holds-Hardware/dp/B0087SBJ3Y/ref=cm_cr_pr_product_top?ie=UTF8
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