Fits most of the main power switches. This is the same part listed elsewhere as BF_57, F_910, MAZ_54, P_234 and W_573. Some switch pins have a female threaded receptacle for the screw that this knob comes with, but this knob will also fit the switches that do not have the threaded receptacle. 5 x 5 mm square hole, larger 34 mm diameter Bremas version. You may also use the W80099, it just doesn't have a screw.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.