Use:Mountain BikesMaterial:Aluminum/Alloy Origin:Mainland China Compatibility with SPD - The bike cleats compatible with SPD SH51 and Look X-Track Series Pedals. Great for indoor cycling spinning and outdoor mountain bike, fits most cycling shoes with 2-holes on the bottom. please check the shoes first before order it. Easy to Install & Use Easy to install and adjust SPD cleat position on bottom of cycling shoes. It comes with bolt; metal washer inserts and wrench. please tight it enough before riding. Practical Design These bike cleats designed for single direction release. It operates using impeccable direction release. Lightweight and Durable Made from highly durable and premium quality alloy to ensure your safety during riding, only 50 g for 2 cleats. EQUIPMENT Includes 2 cleats, 2 cleat washers, and 4 cleat mounting bolts.