The Wera 05059720001 851/4 Phillips/Slotted PlusMinus Bit is a high quality bit with combination profile Phillips/Slotted. In electrical applications screws with mixed geometry (slotted and Phillips cross-recess) are quite common.
Bits having a PlusMinus profile are optimum for addressing these screws. Tough viscous for universal use. 1/4'' hexagon, suitable for holders as per DIN ISO 1173-F 6.3.