EWI Tourcase tm Model BBT-4 and BBT-4DB casters.
These are solidly built, 4" blue-wheeled, swivel casters suitable for all types of road trunks and cases. These casters are available with or without brakes. The wheels are non-marring and utilize two sealed ball bearings for a higher load capacity and longer service life. The load capacity is rated at 150 pounds per caster. The recommended mounting bolts are 5/16" or 8mm.
The brake is a friction brake and not a locking brake; therefore, the brake style casters are suitable for keeping a case from rolling on an uneven stage, but they are not intended to be a substitute for load locking a case in a truck.
If the casters are to be used on any other than EWI caster boards, some modifications may be needed to fit the casters to your particular case.