Bullet Push Pins. Bullet Thumb Tacks Handmade Using Recycled .40 Caliber Bullet Casings. Police Gift, Gun Gift, New Job Gift, Gun Range. Push Pins Handmade with Once-Fired .40 Caliber Bullet Casings. Add a tactical touch to your home office or workspace. Perfect for Law Enforcement Professionals and Gun Enthusiasts . Decorative Thumb Tacks for your Bulletin Board. Set of 5 A portion of every sale benefits military families through Operation Homefront