1. Perfectly fits round tubes, square tubes, flat surfaces and some irregular shapes. Its adjustable clamp spans from 0.59" to 3.15" (1.5–8cm), ensuring compatibility with most fishing boats and railings. 2. The rod holders for fishing boat features advanced double V-shaped threaded clamp and non-slip silicone design for stability. The silicone pad ensures that there will be no scratches on the boat, and you can focus on fight the fish wholeheartedly. 3.The fishing rod holders offer full 360° rotation adjustments both vertically and horizontally, as well as 10° micro-adjustments at multiple angles. 4. Universal cradle holds almost any rod and reel setup.It has a front locking ring to fix rod position, preventing your fishing rod from slipping and getting damaged.