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Made of high quality aluminum alloy and POM, glossy polishing treatment, gorgeous colour, anti-rust, no flaking paint, waterproof, and durable. The chain guide installed in the bike frame can effectively prevent the chains from jumping or falling off, ensure you safe and smooth driving. Very perfect used to protect bike single or gear from falling off during cycling when riding up slope or mountain crossing. Suit for mountain bike, road bike etc. Installation Tips: Adjust the distance about 3mm between outer chain and the smallest flywheel, then adjust the distance 2mm between the chain and chain guide, and lock them tightly by the screw. Size: 68.4x68.6x57.2mm