100% and high quality Features: This bike chain single-disc guide helps guide the chain and prevents it from jumping or dropping. Made of 7075 aluminum alloy, it is strong, durable, and designed for long-term use. Constructed with ultra-light high-strength aluminum alloy and high-quality CNC processing, it offers high strength with low weight. Designed for use with single-disc sprockets, it contributes to a smoother riding experience. Installation is simple and fast—adjustment can be done with a wrench without removing the cranks. Suitable for mountain bikes, it has a compact, lightweight design with a smooth, burr-free surface. Bicycle Chain Guide only; other accessories shown in the image are not included. Specifications: Material: 7075 Aluminum Alloy CNC; Nylon Frame Protector Diameter: approx. 35-31.8mm / 1.38-1.25in (refer to size images for exact measurements) Weight: approx. 52g Color: Black Quantity: 1 Piece Note: No retail packaging. Slight variations of 0-1cm may occur due to manual measurement. Please verify sizing before purchase. The actual color may vary slightly due to monitor differences. Package Includes: 1 x Bicycle Chain Guide