EG15 EG20 EG25 EG30 EGH20 EGH15CA EGH20CA EGH25CA EGH30CA EGH15SA EGH20SA EGH30SA Linear Guideway Guide Rail Block Bearing 
High Precision Linear Bearing 8mm for 3D Printers
$0.39Inside nylon bush, steel bush and graphite bush can be choosed. Nylon Bush Steel Bush Graphite Bush
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This product has multiple variants. The options may be chosen on the product page