As with all WASP SST broadheads, the Jak-Hammer Features: a pre-aligned, Stainless Smart Tip (SST). The edges of the Trocar, Smart Tip are factory- aligned with the rise of the three stainless steel blades creating a straight cutting path that opens a gapping wound channel, ensuring maximum penetration. The three surgically sharp stainless steel blades fold forward in flight and are retained by an O-ring. Blades deploy on impact and fold back to a cutting diameter of 1-3/4 inches on the 100 and 125 grain Jak-Hammers. Replacement Blades, 75 Grain.