Adjustable Mid Mount Rod Holder Aluminum 1.66" or 1-1/2" with Sleeve & Hex KeyThese rod holders are constructed of marine grade aluminum that has been 100% anodized for functionality and style.Features:. Style: Adjustable Mid Mount. Fits rails with 1.66" or 1-1/2" measured OD. Made from Marine Grade Aluminum. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.