Our All-Blade 4-Blade Crossbow Broadhead is designed for 0.355 diameter bolts or smaller that are used on crossbow's that cannot reach minimum suggested feet per second (FPS) of 350FPS that is required for our All-Blade 6-Blade Broadhead. The broadhead has a weight of 10 grains and has 2"+ cutting surface. The diamater of the broadhead is 1 1/8".