【Material】: This free diving reel is made of aluminum alloy, ensuring its longevity and reliability. The product dimensions are 9cmx11.5cm/3.54inchx4.53inch, making it compact and easy to carry. 【Design】: It features an 18mm central hole diameter, designed for optimal functionality in free diving activities. 【Easy to Use】: This reel is user friendly, sturdy (with a maximum load capacity of 250kg), efficient, and ergonomically designed for comfort during use. 【Functionality】: Simply hang it under the buoy; no need for rinsing in fresh water after use. It can be used with any rope with a diameter of 8-10mm, allowing single handed operation for more effective rope pulling than traditional methods. 【Package Includes】: Each package comes with 1pc aluminum alloy reel, providing everything you need for your next underwater adventure. Size Chart: 9cmx11.5cm/3.54inchx4.53inch Package Includes: 1 Scuba Diving Pulley Note: Please allow slightly errors 1-2cm differences due to manual measurement.