Pentagon Tools Hobby Clamps 4 inch 12 Pack For Marine, Wood Working, Crafts or Hobbies Innovative Movable Teeth for Ultimate Flexibility and Tension Marine Grade Strength! Works great to clip on to your boat's bimini top railing to hang beach towels to dry. Great for boating applications, workshops, craft rooms and everywhere you need to hold two things together. Extra Strength Toothed area holds round objects firmly 4" Long, 3" Wide