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Machined bolt pens are pretty cool. They have a durable build and satisfying clicking action. They also feel great in your hand. If you want a pen that can last you years, these are the pens you want.
A few weeks back I was replacing a valve cover gasket on a race car and accidentally rounded off a bolt that was in a hard-to-reach spot. I was working on that bolt in the garage and it took me hours of cursing and trips to the hardware store to get the damaged bolt out and a new one in.