Knob bore 6mmApplicable to RV24YN20S, RV30YN20S, WX112, WX050, WTH118, WH118, WX111, WX030, WX110, WX010 equipotentials.MF-A01 Diameter: 20MM High 12MM Click to buyMF-A02 Diameter: 23MM High 13MM Click to buyMF-A03 diameter: 27MM high 16MM Click to buyMF-A04 Diameter: 33MM High 16MM Click to buyMF-A05 Diameter: 45MM High 20MM Click to buyNote: the size measured by hand may have some errors