Engineered for unstoppable performance, the thunderhead delivers the sharpest blades and highest-quality construction available. Its legacy speaks volumes-more animals have been taken with Thunderheads than any other fixed blade broadhead ever made. Cutting diameter - 1-3/16" with a 3-blades configuration Blades are secured without the use of lock rings or O-rings Engineered for high-speed bows Set of 5 units