Use your 6mm Allen wrench as an 8mm Allen wrench.

This is a handy little adapter to have in your saddle bag. Most compact multi-tools do not have an 8mm Allen wrench. This allows you to keep the tool you have and keep the total weight down. It snaps in place onto the 6mm Allen, so you can also store it on your 6mm. This way it doesn't take up any additional space, and is there when you need it. If you prefer to carry individual Allen wrenches, this allows you to carry one less. 

Specs

• Made of chrome vanadium steel
• Internal clip for staying securely in place