Designed for the Optical Professional this basic aluminum handle comes with a 2.5mm hex nut wrench #TS218. The hex wrench is for hex nuts and star nuts that measure 2.5mm across the flats of the hex material. Please note we also carry wrenches for 2.0mm and 2,25mm hex material. Options please note in order we can exchange the black cap handle for a colored cap RED, GREEN or BLUE. Our handles are assembled in Seattle all components are made in the US. Our business has been making them for over 25 years we have sold 10's of thousands.