1. Fury Tactical Self Defense Keychain with Pressure Tip, 5", Silver (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
Designed in the USA, with inspiration from the Fury sdk the top selling force multiplier on the market

2. SABRE Personal Self-Defense Safety Alarm on Key Ring with LOUD Dual Alarm Siren Heard up to 600 ft/185 meters Away. To Use, Pull Metal Chain from Base (Click Link to Check Price on Amazon)
Editor's Rating : 9.8 out of 10
ATTENTION-GRABBING - 110 dB dual siren alarm helps call for assistance in an emergency and helps deter attacker (audible up to 600 feet/185M away)VERSATILE AND USER-FRIENDLY - this sleek, compact modern design keychain attaches to backpack, purse or keys for convenient, instant access, plus greater value with batteries included

3. Langxun 2 Pack Keychain Folding Pocket Knife / Self Defense Keychain Knife ( BLACK ) (Click Link to Check Price on Amazon)
Editor's Rating : 9.7 out of 10
Keychain Size: Weight-0.75 oz | Open Size-4.9 in | Floding Size-2.8 in | Blade Size-2.1 in | Clour-Black | Packing Quantity-2 pcsKey Shape Design: This key knife is made from stainless steel, key chain tool conceals a compact blade in the size of a standard house key.

4. SHENFAN Self Defense Stinger Duron Drill Protection Tool Nylon Plastic Steel Keychain (Black) (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
Size: 3 x 2 inch Weight: 16g

5. Yucharm-EDC Survival Multi Tool with Screwdriver+Wrench+Bottle Opener Keychain self Defense Pocket Gadgets (Click Link to Check Price on Amazon)
Editor's Rating : 9 out of 10
Condition: 100% New with Sophisticated processing technologySize: The Longest length is 9cm, The longest width is 6cm