trying to find metric parts on amazon is frustrating; seeing a bunch of steel rods listed as 100mm (4"). 100mm is not 4". It's close, but it's not. These ones I ended up with are 4" and _not_ 100mm. really frustrated.
also, all the ones on mcmaster-carr are also imperial measurements. is this a thing?
it looks like misumi has them but requires a quote; that ain't gonna be cheap
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