Increase the cut diameter on your Grim Reaper mechanical heads to up to 2 inches! The cups control the angle of the blades to allow a steeper angle, thus creating more cutting diameter. The new Expander Cups will increase the cut of our popular 85, 100, and 125 gr. Razortip and Razorcut broadheads from 1 3/8 inch to 1 1/2 inch and from 1 3/4 inch to a whopping 2 inches! The new Expander Cups will also increase the cutting diameter from 1 1/8" to 1 1/4" on our 75 gr. mechanicals.