1/4" x 2", Slotted,

Used in models:P2050, SD440A, ST540, ST830, 717, 36, 33, S717, 31, 258, 56, 907, 56B, 905, 909, 259, 400, 166, 260, 256, 144, 10V, 2400V, 2800V, 848, 1426, 178, 855, 1281, 1283, 1282, 1290, 853, 1425, 1280, 185S, 519, 679, 514, 130S, 677S, 513, 512, 510, 165, 518, 675S, 145S, 517, 680, 516, 520, 155S, 511, 770, 776, 768, 351, 775, 390, 771, 590, 352, 571, 391, 769, 6640, 7840O, 6640O, TV145, 8240, 7740O, 5640, 8340, 100V, OD300, OD100, TD50