bakelite radio knobs top screw fixation

{"cid":"91220106","title":"KN15-Y-6 Potentiometer Knob Bakelite Radio Knobs With Pointer Circular Hole Top Screw Fixation","imgUrl":"https:\/\/img.chinax.com\/nimg\/0a\/99\/e6ff687a23828084c0bfbf229b53-200x200-1.jpg","attrs":{"Brand Name":"BONENS","Model Number":"Knob","Place of Origin":"Sichuan, China","name":"Plastic knob cap","model":"KN21-Y","Shell material":"plastic","Inner hole material":"copper core","diameter":"21mm","height":"21mm","Shaft diameter":"6mm","colour":"Red\/Yellow\/Blue\/Green","Fixed form":"Top screw fixation","packing":"100 pieces\/box","Packaging Details":"Carton packaging"}}