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what kind of drill bits are these? Trying to drill through flat side of a fence T-Post
I'm trying to drill through 1/4" hard steel. the thicker bit went through relatively easily one time, but on the second go just spins. the thinner bit did not go far .. i think both need to be ...
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How to choose hole sizes when building a sorting sieve?
I'm planning to build a sorting sieve out of a set of plastic containers with holes drilled in the bottom. The container with the largest holes will be on top and the one with the smallest holes ...