HONEYSEW Upper Serger Knife For Elna PRO4 PRO5 905 925 945 Pfaff 4842 4852 4862 4872#H004131 Upper Serger Knife For Elna PRO4,PRO5,905,925,945 Upper Serger Knife For Pfaff 4842,4852,4862,4872 Upper Serger Knife #H004131 upper blade H004131