Specification:Product Name :Switch KnobShaft Hole Dia.:6mm / 0.24inchOverall Size:20mm x 17mm/0.8inch x 0.67inch(D*H)Material:Plastic, MetalColor:BlackWeight:21gPackage Included:5 Pcs x Switch KnobDescriptions:The Rotary Knob is useful for light dimmer control switch.