Knot Card Set Illustrating 17 Useful Knots. Whether you are preparing for the Tree Worker exam or a seasoned climber, the Pro-Knot card is useful for learning or reviewing your knot repertoire. The 6 waterproof plastic cards (2-1/4 x 3-1/2) detail the following knots: Bowline, Bowline on a Bight, Buntline Hitch, Butterfly Knot, Clove Hitch, Constrictor Knot, Double Fisherman?s, Figure Eight, Half Hitch, Mooring Knot, Prusik Knot, Rolling Hitch, Sheet Bend, Square Knot, Tautline Hitch, Trucker?s Hitch and Water Knot.