To determine what size reel knob you need or weather this knob will fit on your Reel (Shimano, Daiwa, Avet or Accurate); please kindly disassemble your handle knob and following the steps:
Please see below photos (click to enlarge) as your reference.
We need to know the bearings' width of O.D. & I.D. and the Shaft Length; then, we can help you to get the suitable Custom Reel Knob.
Please kindly email us your measurements at email@example.com, we will get back to you ASAP.