These bits will cut through hardened metal like a beaver through toilet paper. For the smaller bits that load onto the front index cards, it's easy to slip your pinky nail under the bottom of the hex head and push the bit a little; This will loosen it up in the card and make it easy to remove. The large bits on the back of the card are not subject to this technique, but they are easier to remove as there is more room around them for your fingers.
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