ROCKY MOUNTAIN FIRST CUT X 100GR BROADHEAD 4-Blade Fixed Broadhead 100 Grain Cut-on-Contact Main Blade 22/64" Aluminum Ferrule .040" Thick Main Blade .030" Thick Bleeder Blade 1 1/8" x 3/4" Cutting Diameter 3 Pack The Rocky Mountain First Cut-X features an 22/64" diameter aluminum ferrule for proper bolt alignment and they are 100% spin tested for enhanced precision and greater devastation. The First Cut-X has been tested and is field point accurate at over 420 fps, for today's crossbow speeds. The Two solid main blades give this 4-blade fixed broadhead a 1 1/8" x 3/4" cutting diameter.