Multi-tools definitely are useful, but not everyone likes jamming the things down into a pocket. That's not a problem with the titanium-bodied K-Smart, since it doubles as a clip-on chainring which can be quickly removed as needed.
KeyUnity KU03 Titanium EDC 6 in 1 Multi-tool Quick Release Carabiner
Popular titanium multi-tool gets lighter and better
【7 TOOLS IN 1】 The Compact Functional Multitool packs 7 functions into a carabiner, including 1/4 Hex bit driver; M4 Hex wrenches; Slotted
KeyUnity KU02 Titanium EDC 7 in 1 Multi-tool Carabiner Keychain | Wrench | Screw Bit Driver | Can Opener | Pry Bar | Screwdriver
Titanium Multi-Tool Key
The Only Tactical Multi-Tool You'll Ever Need: This Titanium Pocket Knife + Glass-Breaker Conquers All - Yanko Design
The Ultimate 11-in-1 Titanium Multi-Function Keychain by Ideaspark — Kickstarter
The Only Tactical Multi-Tool You'll Ever Need: This Titanium Pocket Knife + Glass-Breaker Conquers All - Yanko Design
11-In-1 Titanium Multi-Function Quick-Release Keychain by Ideaspark — Kickstarter
Keychains
Made from lightweight and high strength titanium alloy TC21,With nylon palm rest Handmade with craftsmanship quality, sturdy and durable Light weight
WANERSEN Titanium EDC Pocket Tools Multi Keychain Tool