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Quantity: 1 chain guide Lightweight: machined aluminium mounting arm and Delrin (technical thermoplastic) chain guide body Specifications: Fits 32T to 38T chainrings. Only compatible with 1 x drive systems. Clamp Size: (31.8-34.9mm) Adjustable: designed to adjust for precise installation. Trusted Origin8 brand that stands for quality and durability › See more product details; Product description Origin8 Door QLITE UL chain guide, Mini Clamp On (31.8/34.9 mm); Product description Origin8 Door QLITE UL chain guide, Mini Clamp On (31.8/34.9 mm); Origin8 Door QLITE UL chain guide, Mini Clamp On (31.8/34.9 mm)