Package will vary from the one shown. These new "Goat Head Spikes" solve a major problem for anglers pursuing fish on foot in those slippery rivers we all love so much! These studs screw into any felt or rubber/walnut soled wading boot. Included in this purchase is 30 goat heads and a magnetized nut driver bit. You are now able to give your favorite wading boots "super swamper" traction without breaking the bank or buying new boots!Spikes are 3/8 inches in length.