Durable Material: The bicycle hub adapter is made of high quality aluminum alloy, with high hardness and strong corrosion resistance, the bicycle hub adapter can be used for a long time . Strict workmanship: The bicycle brake disc screws are produced by strict CNC manufacturing, after strict inspection, the quality is excellent, flawless, smooth and delicate, with good gloss. Advanced technology: CNC precision machining of the bicycle brake disc screw ensures that the thread fits your bicycle perfectly, and the bicycle adapter can help you brake the bicycle quickly and stably, it is a great accessory for your bike. Easy Installation: The bicycle brake disc screws have excellent hardness, resist brake wear and are easy to install , bike hub adapter screws are a direct replacement for damaged or old parts.