The Runwell IZA45 is a 4 and 5mm hex key combo wrench. It's handle has an integrated clip which allows you to hook it onto a belt loop, a bag, a keychain, etc. It makes bringing a 4 and 5 mil with you a breeze. The 4 and 5mm bit is easily replaceable meaning this handle to live to over torque your stem bolts another day.
Made in Japan