The Wera 05059720001 851/4 Phillips/Slotted PlusMinus Bit is a 1/4 inch hex drive bit built for combination Phillips and slotted screws. This is a drive bit designed for fastening mixed-geometry screws, especially in electrical applications where combination head screws are common. Model Number: 05059720001. If you run into terminal screws that never seem to fit quite right with a standard Phillips bit, this is the profile made for that job.

What matters here is the PlusMinus tip geometry. Instead of forcing a regular bit into a screw head that blends slotted and cross-recess shapes, this bit is made to match that screw style correctly. In real use, that means better contact in the fastener, less slipping, and less damage to screw heads when you're working on devices, panels, and electrical hardware.

The 2-3/4" (70 mm) overall blade length gives you more working reach than a stubby insert bit. That can help when screws are set deeper in housings or when surrounding parts limit tool access. It is still a straightforward bit, not a specialty attachment that needs a dedicated tool, so it is easy to carry in a daily-use kit for service work and install work.

Wera also calls this bit tough viscous for universal use. In plain terms, it is built to handle regular fastening work without being overly brittle. For pros and serious DIY users, that matters because a bit that fits the screw correctly is already doing half the work of reducing wear on both the bit and the fastener.

On the connection side, the 1/4 inch hexagon shank is suitable for holders as per DIN ISO 1173-F 6.3. That gives it broad compatibility with standard bit holders, screwdrivers, and power tool adapters that accept this common interface. You are not locked into a proprietary holder system.

This bit makes the most sense for electricians, maintenance techs, panel builders, and anyone who regularly deals with combination head screws. It is also a smart choice for a general service kit if you want the right profile on hand instead of improvising with a standard Phillips bit and hoping for the best.

Small Bit, Big Difference on Electrical Fasteners

The Wera 05059720001 851/4 Phillips/Slotted PlusMinus Bit is the kind of bit you buy once you get tired of using the wrong profile on combination screws.

• Who it's for: Electricians, maintenance crews, and anyone who runs into Phillips/slotted combination screws on a regular basis.
• Why it stands out: The PlusMinus profile is the real value here, and the 2-3/4" (70 mm) length gives it better reach than a short insert bit.
• Worth knowing: This is a purpose-built fastening bit, so it makes the most sense if you actually see combination head screws in your day-to-day work.

• What type of screws is this bit made for? It is made for combination Phillips and slotted screws, often called PlusMinus screws.
• What is the tip size? This bit uses a Phillips #1 tip size in a PlusMinus profile.
• Will it fit a standard bit holder? Yes. It has a 1/4 inch hex shank and is suitable for holders as per DIN ISO 1173-F 6.3.
• How long is the bit? The overall blade length is 2-3/4" (70 mm).