A. This fishing reel drum is equipped with an aluminum alloy oval grip knob and a single rocker arm, making it a good accessory for fishing reel modification. Made of aluminum alloy, it is sturdy and durable, adding reliable performance to your fishing reel. B. Its unique design features are quite eye - catching. The oval grip knob is distinctive and offers a comfortable feel, allowing you to operate the fishing reel more easily. The diameter of the grip knob is 42 millimeters, which is a moderate size. It won't be too large to affect the operational flexibility, nor too small to cause unstable gripping. The rocker arm is 94 millimeters long, providing a more suitable lever arm for your fishing operations and making it more labor - saving to use. The 5*8 millimeter hole spacing is precisely designed for a good match and easy installation, enabling you to easily complete the modification and upgrade of the fishing reel. C. Whether you are an experienced angler or a novice in the fishing field, this rocker arm can enhance your fishing experience. It can improve the performance and operational feel of your fishing reel to a new level, making each fishing trip more convenient. D. It is suitable for various fishing scenarios and is a good choice for improving the performance of the fishing reel.