1. Smooth surface, good wear resistance, flexible sliding.2. This guide pulley is a great tool for you to build track systems for lockstitch machines, sewing machines, and more.3. The guide pulley is made of Alumina Ceramic, durable, and lasts for a long time. The smooth surface makes it slide flexibly, has low noise, and is more wear-resistant.4. Please make sure that the shaft hole diameter is matched your device before purchasing.
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