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The rubber material is flexible enough to slide over the lead screw without tearing, and it seals the control box hole perfectly. I’ve noticed way less dust and metal chips building up around the motor since I installed it.

Finally, a dust cover that actually stays put once you push it into the control box hole. It’s a simple rubber piece, but it keeps chips and debris out of the lead screw area perfectly. Exactly what I needed for my CNC setup.

Finally got around to installing this rubber guard and it's a perfect fit over the lead screw hole. Keeps the metal shavings out of the control box just as described.