Brushcutter starter pulley compatible with JONSERED McCULLOCH PARTNER External diameter (mm): 70 Inside diameter (mm): 12 / 19 for models: JONSERED CS 2137, 2035 McCULLOCH MAC CAT 335, MAC CAT 338, MAC CAT 435, MAC CAT 438, MAC CAT 440, MAC CAT 442, MAC 4-20 XT PARTNER 351, 371