Muzzy 75Gr. Broadhead replacement blades for 75Gr. 3-Blade Screw-Ins. Includes 6 sets of blades for 18 total blades. Muzzy Broadheads are legendary for their "Bad to theBone" dependability and true flight. It begins with the hollow-ground design of the Muzzy Trocar tips, responsible for the exceptional penetrating power.