Wiha 71397 Hex Insert Bit Set 2-6mm 6 Piece

Product Description

The WIHA 71397 is a six-piece hex insert bit set covering the most common metric hex sizes used in mechanical and electrical trade work. Each bit is a standard insert style, designed to seat into 1/4-inch hex-drive power tools, impact drivers, and bit holders. The set spans 2 mm through 6 mm in increments, giving technicians a compact selection for fasteners encountered in panel assembly, equipment installation, and service work. At 0.21 pounds, the full set is lightweight enough for a belt pouch or tool bag. WIHA is recognized in the trade for consistent dimensional tolerances and bit-tip hardness that resists cam-out under repeated torque cycles.

This set is well suited for HVAC technicians, electricians, and general mechanical service professionals who regularly work with metric hex-socket fasteners on equipment covers, motor mounts, brackets, and control enclosures. The 2 mm through 6 mm range covers the majority of metric hex fasteners found in residential and light commercial equipment. Individual bits can be swapped into any standard 1/4-inch hex bit holder or magnetic extension, making this set a practical addition to a multi-driver setup on the service truck.

Key Features

• Six hex insert bits in one set: 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, and 6 mm
• Insert-style bits fit standard 1/4-inch hex-drive holders and power tools
• Compact metric range covers common fastener sizes in HVAC, electrical, and mechanical service
• Lightweight set at 0.21 pounds for easy carry in a tool pouch or bag
• WIHA manufactured tooling with tight dimensional tolerances for reliable seating and torque transfer

Compatibility

Designed for use with any standard 1/4-inch hex-drive bit holder, magnetic bit extension, or power tool with a 1/4-inch hex chuck.

Installation Notes

Insert bits should be fully seated in the bit holder before applying torque to prevent bit walk or fastener damage. Inspect each bit tip for wear or rounding before use, particularly when working on soft alloy fasteners common in equipment panels. No special licensing is required to use hand tools, but always de-energize equipment before opening electrical enclosures or accessing fastener-secured covers per applicable NFPA 70E safe work practices.