Croch high quality boat rod holders are made of thick plastic and the screw clamp is made of sturdy metal. So even a larger fish can pull on it without breaking off with the whole holder. These rod holders are very versatile with many adjustment options. Work great and easy to install. Easy to adjust and super stable. To attach to the boat or kayak, you only need to loosen the lower screw, put it on and tighten it again. Fix the holder to something tight and insert the rod into it. Strength is also adjustable. Croch high quality boat rod holders make fishing much easier. It is just comfortable to rest.