Gunsticles Tactical Testicles are glorious rifle mounted plastic juevos for your railed rifle system! They are also a great way to impress your friends, family, and neighbors! Package contains the rail mounted Gunsticles Tactical Testicles assembly with a set screw specifically designed to protect your rifle's finish, and a complimentary hex wrench.  An instruction and safety manual is also included for your reference.Gunsticles Tactical Testicles - Finally, the balls your railed rifle system has been lacking!