A13 Photographers Multi-Tool 5/32 (4mm) Allen Wrench Hex and Flat Head Key Chain Tool
Brand: ProMediaGear

540 Hardened Polished Stainless Steel Heat Treated for Increased Harness Precision CNC machined to exact size Flattened Stainless Steel 1-inch Keyring

Great tool to always have it with you. Attach to your camera bag or keychain ring.
Much Easier to Keep with you than Allen Wrenches
Always Handy even for non-photography tasks.