Cobra 4-Piece Cutter Set Drain Opening Tool. It is used with 3/8" cable found on cable drum machines, 40 series, True Value #'s 870-246 & 416-693. The set includes (1) grease cutter, (1) straight boring head, (1) side cutter, and (1) spear head cutter. It is suitable for use with 40 and 45 series 5/16 - 1/2 inch cable. UL Listed.