Easy to install and convenient to use. Suitable for MTB bike, perfect bicycle accessory during your cycling trip. Converts any multi-speed bike to a single speed for hanger dropout frame, prevent chain slippage. Made of aluminium alloy, long-lasting, practical and rustproof. Designed to provide a simple, effective and adjustable way to tension a single speed system. Description: - Made of aluminium alloy, long-lasting, practical and rustproof. - Designed to provide a simple, effective and adjustable way to tension a single speed system. - Converts any multi-speed bike to a single speed for hanger dropout frame, prevent chain slippage. - Easy to install and convenient to use. - Suitable for MTB bike, perfect bicycle accessory during your cycling trip. Specification: - Material: Aluminum Alloy Size Chart: Size: 98.3x65.7x26.6MM/3.87x2.59x1.05inch Package Includes: 1 Piece Bike Chain Tensioner 2 Pieces Wrench Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!