Wiha 71990 39-piece Screwdriver Insert Bit Set

Product Description

The WIHA 71990 is a 39-piece tamperproof screwdriver insert bit set covering seven tip types: Hex, Phillips, Slotted, Spanner, Square, Torx, and Tri-Wing. This set is designed for trade professionals who need a single kit to handle a wide range of fastener types, including tamperproof security fasteners found in HVAC equipment, electrical panels, and mechanical assemblies. The 39 individual bits span an extensive size range across all tip types, making it a practical bench or field kit for licensed HVAC technicians, electricians, and service professionals who regularly encounter security hardware. The set weighs 1 pound.

This bit set is suited for residential and light commercial service work where tamperproof fasteners are common, including HVAC unit access panels, electrical enclosures, pool equipment housings, and plumbing fixture assemblies. The inclusion of Torx security bits ranging from TR-8 to TR-40 and Tri-Wing bits from size 1 to 4 makes it especially useful for equipment manufacturers that use proprietary fastener profiles to restrict field access. Spanner bits cover sizes 4 through 10, and Square (Robertson) bits cover sizes 1 through 3.

Key Features

• 39-piece tamperproof bit set covering Hex, Phillips, Slotted, Spanner, Square, Torx, and Tri-Wing tip types
• Torx security sizes T-8S, T-10S, T-15S, T-20S, T-25S, T-27S, T-30S, and T-40S (TR-8 to TR-40 range)
• Hex sizes included: 1/8, 3/32, 5/32, 5/64, 7/64, and 9/64 inches
• Pozidriv point sizes 0, 1, 2, and 3 alongside Phillips sizes 1 and 2
• Square sizes 1, 2, and 3; Spanner sizes 4 through 10; Tri-Wing sizes 1 through 4
• Compact 1-pound kit suitable for toolbox, van, or bench storage

Compatibility

Designed as a general-purpose tamperproof insert bit set compatible with standard 1/4-inch hex bit drivers, impact-rated bit holders, and screwdriver handles accepting insert bits.

Installation Notes

Insert bits are installed and removed by hand into a compatible 1/4-inch hex driver or bit holder. Ensure the driver is rated for the torque output of the tool being used, particularly when paired with impact drivers. For work inside live electrical panels or energized HVAC controls, follow NFPA 70E lockout and tagout procedures before using any hand tools on fasteners. Inspect bits for wear or rounding before use to avoid fastener damage.