T O K G O - Kayak Deck Plastic Flush Mount Fishing Boat Rod Holder and Cap Cover, 2 Pcs a Pack Approx. 40mm inside tube Diamater . Length: approx. 200mm 3 fixing point for quick rod adjustment. 30 degree angle designed head. Easy to install; mounts to kayak deck Made of special plastic, non-toxic harmless, and anti-aging.