Product: Quick-Release Folding Bike Seatpost Clamp (Colorful) — Compatible with Dahon Sp8 Key benefits Secure hold: quick-release ring locks the seatpost firmly to prevent slipping during rides. Lightweight and durable: made from ultra-light aluminum alloy to reduce weight without breaking or deforming. Easy adjustments: quick-release lever lets you change saddle height fast — no tools needed. Comfortable, reliable grip: ergonomic lever design improves handling and delivers a more confident, safer ride. Compatibility and sizing Seatpost diameter is commonly 33.9 mm. Select the clamp that matches the size of your existing clamp. Polished or brushed seatposts: choose the 40 mm clamp. Lacquered (painted) seatposts: choose the 41 mm clamp. Available sizes: 40 mm / 41 mm. Model compatibility: designed for folding bikes and confirmed compatible with Dahon Sp8. Material and performance Construction: ultra-light aluminum alloy for strength and low weight. Function: quick-release mechanism for fast, repeatable saddle adjustments and secure locking. Design: ergonomic lever and clamp profile for better grip and easier operation. Typical use scenarios Daily commuting: quickly adjust saddle height between stops and lock it securely for a stable ride to work. Shared or family bikes: rapidly change seat position when multiple riders of different heights use the same bike. Travel and folding storage: lightweight clamp that holds up under frequent folding/unfolding and packing for trips. Technical summary Type: Quick-release bicycle seatpost clamp (folding bike style) Sizes: 40 mm / 41 mm Material: Ultra-light aluminum alloy Compatibility: Dahon Sp8 and other folding bikes using the same clamp diameter Fit guidance: Match clamp size to your existing seatpost clamp; seatpost diameter is usually 33.9 mm Use this clamp when you need a lightweight, durable, and easy-to-operate solution that keeps your seatpost secure and lets you adjust saddle height quickly and reliably.