Package Includes: 4PCS Vinyl Inserts for Fishing Rod Holder. Package Includes: 4PCS Vinyl Inserts for Fishing Rod Holder. Dimensions: Inner diameter: 1-5/8 inches; length: 9 inches. Widely applicable: It is very suitable for marine applications, including boats, yachts, boats and caravans, campers and various uses. High quality: injection molded PVC; Anti-ultraviolet, waterproof, rust-proof, durable. Easy installation They are easy to install as soon as they are scalded with hot water before installation.