Wiha 71988 38-piece Screwdriver Insert Bit Set 0.25 in Drive

Product Description

The WIHA 71988 is a 38-piece tamperproof screwdriver insert bit set built around a 0.25 inch drive. It covers a wide range of tip types in a single kit: Phillips, Pozidriv, slotted, spanner, square, standard Torx, and tamperproof Torx. The set addresses the full scope of fastener types encountered in electrical, HVAC, and equipment service work where tamperproof hardware is common. At 1.02 pounds and packaged in a compact case measuring 5.6 inches by 4.1 inches by 2.1 inches, it stores easily in a service bag or toolbox drawer. Electricians, HVAC technicians, and general service trades will find the range of included sizes practical for both residential and light commercial applications.

This set is suited for service and maintenance work on equipment that uses security fasteners, panel covers, and access doors. The tamperproof Torx range from TR-8 to TR-40 makes it directly applicable to HVAC equipment enclosures, electrical panels, and commercial appliance service. The inclusion of Pozidriv bits alongside Phillips sizes expands usefulness on imported equipment and European-manufactured components. Square drive bits in sizes 1, 2, and 3 cover a large share of the North American electrical device market.

Key Features

• 38-piece set covering seven tip types: Phillips, Pozidriv, slotted, spanner, square, Torx, and tamperproof Torx
• Tamperproof Torx range from TR-8 to TR-40 for security fastener applications
• 0.25 inch drive fits standard bit holders, extension bars, and impact-rated adapters
• Hex sizes from 5/64 inch through 1/8 inch for Allen-style fasteners
• Spanner sizes 4, 6, 8, and 10 for tamper-resistant spanner-head screws
• Tri-wing sizes 1, 2, 3, and 4 included for specialized security fasteners

Compatibility

Designed for use with any 0.25 inch drive bit holder, screwdriver handle, or impact driver adapter that accepts standard insert bits.

Installation Notes

Insert bits should be seated fully into the bit holder before applying torque to avoid cam-out or tip damage. Always de-energize electrical equipment and follow lockout/tagout procedures before removing fasteners from live panels or equipment enclosures. Tamperproof bits are drive-specific — confirm the correct Torx or spanner size before engaging the fastener to prevent rounding. Bit sets of this type are typically used by licensed electricians and HVAC technicians working under NEC or local mechanical code requirements.