The easily rotatable and replaceable plastic sleeves protect the rims when fitting the wheel bolts.

The different colours of the plastic sleeves (HAZET colour code) show you at a glance which wrench size you are holding:

Grey / white = 15 mm outside hexagon | 903SLG-15

Light blue = 17 mm outside hexagon | 903SLG-17 | 903SLG6-17

Yellow = 19 mm outside hexagon | 903SLG-19 | 903SLG6-19

Red = 21 mm outside hexagon | 903SLG-21

Green = 22 mm outside hexagon | 903SLG-22

The sleeves are also sustainable - good for the environment: instead of disposing of the complete nut-driver, simply fit a new plastic sleeve and your rims will continue to be protected

You can find all the tools you need for changing wheels and tyres here