The Ravin Aluminum Broadheads, designed exclusively for Ravin Crossbows, give hunters surgical precision with its rear-deploying blades, which open on impact and have been tested and approved for crossbows shooting up to 450 FPS. This mechanical broadhead has a massive 2-inch cut and internal spring clip, eliminating the need for lock rings and O-rings. Give hunters surgical precision Rear-deploying blades Blades open on impact Massive 2 inch cut Internal spring clip No need for lock rings and O-rings 100 grain broadhead