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Product function:This crank bolt serves as fixing fastener, used to secure crank arm onto crankshaft for road bike and mountain bike crankset. Material advantage:Made of high‑strength CNC machined aluminium alloy, lightweight, firm and durable for long‑time cycling use. Applicable scene:This crankset arm screw is ideal replacement part for worn, rusted or damaged original crank fixing bolt. Processing feature:Precise thread machining ensures smooth fitting, stable connection and not easy to slip during riding. Installation tip:Standard inner hexagon structure, convenient to mount and remove with corresponding bicycle maintenance tools.