Thanks Rob, but I believe they are 5/8 inch closed per Rocky's website:
THE BROADHEAD YOU CAN TRUST
Super tough, two blade expandable broadhead with Cam Action Blade System. This is one hard hitting head that features a blade insert tip that cuts on impact. Flies like a field point, penetrates with power.
100 Grain - 2-Blade Open-On-Impact design
Comes assembled with rearward sliding/expanding blades that eliminate deflection on angled hits
Traditional Cut-On-Impact Tip for maximum penetration
.035" thick, stainless steel Blades
5/8" closed, 1 3/8" expanded cutting dia.
Guaranteed entrance hole