For controlled tightening of wheel nuts on light-alloy rims Plastic sleeves for damage-free work on aluminium wheel rims Colour coding for ease in identifying the right size Machine-operated, fixing with safety ring / pin Phosphated surface Square drive as per DIN 3121 - G 12.5, ISO 1174 Acc. to DIN 3129, ISO 2725-2 Chrome-molybdenum steel