Plugs into existing bases used on many Fender and Vox amps cabinets. These castors are supplied each and without the plug in base. I.E they are to replace existing broken bearing castor wheels
50mm / 1.97 Plug-In Castor
With Soft Rubber Black Wheel.
Load Capacity 45.359Kg / 100Lb
Please check dimensions to ensure that they match your existing castors but we’ve used these on Fender, Vox, Ampeg amps without issue.