Sturdy and Durable: The rearview mirror 15? bracket is made from 1? x 3/8?, 6063 Aluminum that is TIG-welded onto a 1 1/2?x 1 1/2? channel to fit over your pontoon rails. 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. Simply install the mounting bracket on your pontoon rail and tighten the screws. Additional Details ------------------------------ Product description: Sturdy and Durable: The rearview mirror 15? bracket is made from 1? x 3/8?, 6063 Aluminum that is TIG-welded onto a 1 1/2?x 1 1/2? channel to fit over your pontoon rails. 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. Simply install the mounting bracket on your pontoon rail and tighten the screws.