Stainless Steel .Flush Mount .Swivel Rod Holders . 80 Series .15° .10-1/2" Length .1-7/8" ID .Swivel base ideal for bent butt rod fishing . Swivels to follow the fish without removing the rod from the rod holder. Great for tuna or other large fish . Cast 1-piece stainless steel swivel cup . Super smooth turning precision-machined 1/2" pivot with fine threads .