Rotary Corp brand aftermarket product. Rotary Corp Brand Ogura Electric Clutch AYP 112233, 539112233, 539112233, For TCA20484 and Ogura GT1A-HU02. ID 1", Height 3-5/32", Pulley Diameter 5-5/16". Uses 5/8" width belt. Models Z4217, 4819, 4822, 4824, 5221, 5424.