Sturdy and Durable: The Pontoon Boat Bimini Round Pole Rearview Mirror 12? bracket is made from 1? x 3/8?, 6063 Aluminum that mounts securely to ?, 1?, and 1 1/4? poles and is multi-directional. The mirror housing is made of durable plastic, and the mirror is tempered glass. Therefore, it has the characteristics of high hardness, oxidation resistance, corrosion resistance, and durability. The convex mirror design has a high-definition mirror, and it ensures that the driver can clearly see the situation behind the pontoon boat to improve safety. 360 Degree Adjustment: The ball-joint design makes it easy to adjust the angle of the mirror, providing both convenience and safety for the driver. Easy to install: You don?t need to drill or modify anything. Install on the round Bimini pole and tighten the screws. Proudly Made in USA! Additional Details ------------------------------ Product description: Sturdy and Durable: The Pontoon Boat Bimini Round Pole Rearview Mirror 12? bracket is made from 1? x 3/8?, 6063 Aluminum that mounts securely to ?, 1?, and 1 1/4? poles and is multi-directional. The mirror housing is made of durable plastic, and the mirror is tempered glass. Therefore, it has the characteristics of high hardness, oxidation resistance, corrosion resistance, and durability. The convex mirror design has a high-definition mirror, and it ensures that the driver can clearly see the situation behind the pontoon boat to improve safety. 360 Degree Adjustment: The ball-joint design makes it easy to adjust the angle of the mirror, providing both convenience and safety for the driver. Easy to install: You don?t need to drill or modify anything. Install on the round Bimini pole and tighten the screws. Proudly Made in USA!