This is my single-piece spanner/wrench tool with a range of metric hex nut drivers (5, 5.5, 7, 8, 10, 13 and 17mm) and a 1/4" hex bit driver.
An o-ring is required to complete the assembly to help hold a 1/4" hex bit in the driver slot (7mm ID, 2mm diameter, not included).

This model is designed to be printed in Stainless Steel or one of it's variants.
The tool can easily be secured to a keychain or lanyard with a 10mm split ring or a No.2 McGizmo clip or similar 25mm gate clip.

There are some more photos of this object and other examples of my work, both 3D printed and otherwise, on my 'Tofty' facebook page.