ITEM NAME:10 Pcs Slide Potentiometer Mixer Fader Knob 19mmL x 12mmW for 4mm Shaft M&O Specs: . These are plastic control knobs for slide potemtiometers, fit 4mm shaft. Dimensions: . Length: 19mm . Width: 12mm . Thickness: 13.5mm.Quantity: 10 PCs. Thickness: 13.5mm.