Material: aluminum alloy; size: 1.5M, 1.7M, 2.1M, 2.4MThe length adjustment lock buckle is made of ABS engineering plastics, and the locking bracket of the lock is stable, fast, convenient and practicalRear-mounted antenna support, three-layer reinforced antenna base, high strength and good stability, can withstand all kinds of fishing rodsThe main body of the bracket is made of high-density aluminum alloy, and the oxidation treatment has a very high hardness, strong and durableThe bracket head is inlaid with stainless steel plate, the surface is covered with plastic, and the inside is made of thick steel plateNotice:1. Please check the size before buying. Due to manual measurement, an error of 0-5mm will occur. Please understand!2. Excluding items other than the fishing rod holder shown in the product photos.3. Please note that due to different monitors, there may be slight color difference, please understand.4. The above data is for reference only, the size is manually measured, each variable may be different, please refer to the actual product, thank you.5. If you find any problems with our products, please feel free to contact us by email, we will solve the problem as soon as possible.6. Welcome your sharing and feedback so that we can provide you with better products and services.7. Thank you for visiting my store, click to enter my store, there will be a lot of products for your reference.