Smith Aluminum Horizontal Clamp-On Rod Holder 1.66 OD – White Powder Coated with Sleeve. Aluminum Horizontal Clamp-On Rod Holder OD – White Powder Coated with Sleeve: C. Smith’s line of white powder coated clamp-on rod holders offer a great alternative to stainless steel. These rod holders are constructed of marine grade aluminum that has been 100% anodized for functionality and style.. Aluminum Horizontal Clamp-On Rod Holder OD – White Powder Coated with Sleeve : C. These rod holders are constructed of marine grade aluminum that has been 100% anodized for functionality and style. Fits rails with 1.66 measured OD. Made from Marine Grade Aluminum. Please allow us the opportunity to resolve any issues before opening disputes and/or leaving feedback. If the item includes an ac power adapter for use, it will be 120 volts. Please ensure that this product is compatible with the standards within your country before purchasing.