The Regal Royal Fly Tying Vise Clamp is handcrafted by fly angler pros. This clamp is constructed with a three-point anchor system with surface guards to ensure a secure, solid grip to your work surface. The Royal Fly Tying Vise Clamp will attach to surfaces between 1 and 3 1/4 inches The best part is it is portable and light enough to take with you on fishing trips.