I bought these hoping that i could use them as a replacement on the standard 6mm pistol crossbow bolts. The thread is too narrow for standard 6mm bolts, HOWEVER, a little bit of JB weld sorted that problem out. The broadheads themselves are not sharp but they are solid and as a result pack a powerful penetrative punch and as a bonus, they fit in and fire from the Man Kung sobek magazines with no other modification needed, which is very handy indeed.