Tactical Black Screw Cap Glass Breaker Tip Pen with FlashlightIf you've ever taken martial arts, you've seen a small finger size wooden stick called a kubotan.  There are many tactical uses for a kubotan.  One such use is to paralyze your attacker in a fight by hitting them in the clavicle with the kubotan.  This will nearly always immobilize their affected arm.

You can however use other tools like a pen, pencil, chopstick or just about anything that can withstand a small impact to penetrate the body.  There's now a product called a tactical pen which acts somewhat like a kubotan.  Its more sturdy than a pen and built with a durable encasing.  One blow from this would stop almost any attacker.