It is the old green seeker blank
attach hook, sinker and bobber
They are durable, come in a variety and weight classes, and will easily fit the bill
Be sure to measure the circumference of your tubing to ensure the perfect fit!Anodized clamp-on boat fishing rod holder fits 1.875, 2, 2.25, 2.375 and 2.5 round tubingMade of high-quality, marine-grade aluminum extrusions and cold-drawn tubingClamp size: 2.5 with rubber liners to fit 2.375, 2.25, 2, and 1.875 tubing.Internal rubber insert to protect your fishing rod from any wear against the metal surfaceInside diameter is 1 5/810 3/8 overall lengthCan be mounted to vertical or horizontal barsClamp turns and locks in infinite positions due to the full 360-degree rotational adjustmentEasily mounts to T-Top or other hardtops, tower, radar arch, rail, or any structure made from 1.875, 2, 2.25, 2.375 or 2.5 round tubing.Holds 1 fishing rodTo determine your tubing size for the correct fitment, you will need to measure the circumference (all the way around) of the tubing you will be attaching to