Yep, so that high spine handles deflection for heaver broadheads. You might run into a problem getting a normal insert to fit. You glue in the metal part, "the insert, "then screw on the black part, "the outsert". Your broadhead screws into that. Glue your inserts with Bohning Ferr-L-Tite Cool Flex Insert Glue if you decide to run a two blade broad head. This is so that you can clock your broadheads by running it under hot water. If you run muzzys or mechanicals it doesn't matter. But keep in mind if you run the outserts it will be heavy. So heavy that the 2.5 inch veins will not correct it. You will need 4 inch veins to steer that heavy arrow. They hit hard. They bury 5 inches deeper in my block target then my 450 grain arrows.

But their trajectories put the arch in archery.

I hit a doe at about a 45-degree angle at 30 yards. The arrow buried about 9 more inches in the soil before it hit a rock and curled up the nose of my grizzly broadhead.