Product Details Brand: ROCKBROS Materials: Body: Nylon + Glass Fiber Long Screws: Stainless Steel 304 Short Screws: Chrome-plated Carbon Steel Threaded Inserts: Brass with Black Zinc Coating Compatibility: Road Bike, MTB, City Bike Weight: approx. 95 g Color: Black Flexible Positioning: Featuring two parallel rows of holes with different mounting points, this adapter can be flexibly installed at various angles. It easily adapts to different frame geometries and use cases – whether on a road bike, mountain bike, or city bike. High-Quality Components: For maximum durability, it uses stainless steel screws (304, long), chrome-plated steel screws (short), and black zinc-plated brass threaded inserts. This solid material combination guarantees reliable performance even with frequent use. Multifunctional Bottle Cage Adapter: This practical bottle cage adapter is designed for versatile applications – ideal for mounting additional bottle cages, mini pumps, or saddle bags. Perfect for long-distance rides or bikepacking tours where extra carrying capacity is needed. Robust & Lightweight: Made from glass fiber-reinforced nylon, the adapter offers high stability with low weight (only approx. 95 g). The textured surface with a carbon-look finish enhances scratch resistance and provides a premium appearance. Easy Installation: Mounting is achieved via a sturdy clamp around the seat stays. Installation is straightforward – only a 4 mm Allen key is required (not included). Even on rough terrain, the adapter stays firmly in place without annoying wobbling.