Replacement pressure adjustment bracket for all ARL and CSL/Classroom series roll laminators except CSL/Classroom Series I and does not fit machines with the following serial number sequences: 0****-****, 1****-****, 4****-****, 5****-****, 9****-****, G****-****, W****-****, or machines with with serial numbers beginning with ">H."> May be listed as part number 401B or A3881 in Owner's Manual.