Wiha 77891 11-in-1 Multi-driver Screwdriver Set

Product Description

The WIHA 77891 is an 11-in-1 multi-driver designed for trade professionals who need a single, compact tool capable of handling a wide range of fastener types on the job. The handle accepts interchangeable bits covering No. 1 and No. 2 Phillips, 3/16 inch and 1/4 inch slotted, and No. 1 and No. 2 square drive configurations. This versatility makes it a practical addition to any HVAC, electrical, or plumbing service kit where switching between multiple individual screwdrivers is inefficient. The tool weighs 0.55 pounds, keeping the load light during extended use. Built for everyday trade service work, the 77891 consolidates eleven driver functions into one ergonomic tool.

The WIHA 77891 is suited for residential and light commercial service applications where technicians encounter mixed fastener types across equipment panels, junction boxes, and plumbing access covers. HVAC service techs will find it useful for control board access covers and blower compartment panels. Electricians can use it on outlet and switch hardware. Plumbers will find the square and slotted tips practical for fixture and valve trim work. It ships as a single unit and is ready for immediate use without additional accessories.

Key Features

• Eleven driver functions in a single tool — No. 1 and No. 2 Phillips, 3/16 inch and 1/4 inch slotted, No. 1 and No. 2 square drive
• Lightweight at 0.55 pounds for reduced fatigue during extended service calls
• Interchangeable bit system reduces the number of individual tools carried on the job
• Compact multi-driver format fits standard tool pouches and service bags
• Covers the most common fastener types encountered in HVAC, electrical, and plumbing service work

Compatibility

Designed as a general-purpose multi-driver compatible with standard Phillips, slotted, and square drive fasteners commonly found in residential and light commercial trade applications.

Installation Notes

De-energize any electrical equipment before accessing panels or fasteners in live circuits, in accordance with NEC lockout/tagout requirements. Ensure the correct bit is fully seated in the driver before applying torque to avoid cam-out damage to fastener heads. Bits should be inspected periodically for wear and replaced if tips show rounding or deformation.