Description 6004ZZ (6004Z) metal shielded bearings used on many scooters, ATVs, mini bikes, dirt bikes, and go karts. This is a set of two bearings. Please check the specifications tab for detailed dimensions on these 6004ZZ bearings. Chrome metal shields on both sides of the bearing shield the inner ball bearings from the elements. Always replace scooter and ATV wheel bearings in sets of two. Known markings: 6004ZZ 6004Z 6004-ZZ 6004-2Z Specifications Diameter (Outer): 45 mm Diameter (Inner): 20 mm Width: 12 mm Compatibility Jonway YY50QT-3 Jonway YY50QT-5 4-Stroke Jonway YY50QT-6 4-Stroke Jonway YY50QT-10 4-Stroke Jonway YY50QT-21 4-Stroke Jonway YY50QT-28 4-Stroke Jonway YY50QT-29 Jonway YY125QT-21 Jonway YY125T Jonway YY125T-2 Jonway YY125T-2A Jonway YY125T-3 Jonway YY125T-4 Jonway YY125T-8 Jonway YY125T-10 Jonway YY125T-12