I bought them to put on my Cr-10 v2. They appear to be well made and easy to adjust to fit the printer. You'll need to file/cut/sand the side of them to make one of them fit onto the lead screw next to the stepper motor. On a bolt with nothing near the nut, you don't need to change it. They are made of brass so soft and easy to work with. I bought a second set to have one for my Ender 3 with an extra for a future printer.
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