Drop-in Swivel. Drop-in Swivel instantly converts any in-gunnel rod holder to a swivel rod holder. Fits inside any rod holder with 1-9/16" or larger inside diameter. Investment cast 316L stainless construction. Smooth turning adjustable swivel resistance.. Great for:. Fast trolling heavy baits. Bottom fishing with electric reels. Bent butt rods. Fighting big fish from the rod holder. 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.