Smith Adjustable Mid Mount Rod Holder – 1-1/4″ or 1-5/16″ OD – White Powder Coat Aluminum with Sleeve & Hex Key. Adjustable Mid Mount Rod Holder – 1-1/4″ or 1-5/16″ OD – White Powder Coat Aluminum with Sleeve & Hex Key: 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..