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Wiha Tools 71990 39-piece security bit set in a storage case

Wiha Tools

Wiha Tools 71990 39 Pc Security Bit Set Nutdriver

SKU CH-4A3Q-3QKW3 MPN 71990

39-piece security bit set covers Torx, hex, spanner, tri-wing and square drives for tamper-resistant fasteners

  • TypeHex Drive Bits
  • 39-piece security bit set covers Torx, Hex, Phillips and specialty drives
  • Alloy steel shank with chrome vanadium molybdenum bits resists wear under high torque
  • Magnetic quick-change holder speeds bit swaps on the job
  • Cushion-grip handle reduces fatigue during extended fastening tasks
  • Compact separate case keeps 39 pieces organised and portable

39-Piece Security Bit Set

The Wiha Tools 71990 is a 39-piece security bit collector set designed for technicians who encounter tamper-resistant fasteners. It supplies a comprehensive range of driver profiles including Torx, Spanner, Tri-Wing, Torq-Set, Square, Pozidriv, Phillips, Slotted and Hex. Bits are manufactured from chrome vanadium molybdenum steel for durability. A separate storage case keeps the assortment organised.

For Specialist Fastener Work

This set suits maintenance engineers, appliance technicians and security installers who regularly service equipment secured with proprietary heads. The inclusion of Torq-Set and Tri-Wing bits covers aerospace and consumer electronics applications. Buyers who only require standard Phillips, Slotted or Hex drivers for general assembly will find the specialised security profiles unnecessary.

1/4-Inch Hex Drive Compatibility

Every bit in the collection features a 1/4-inch hex shank for use with standard quick-change holders and multi-bit screwdrivers. The magnetic quick-change feature allows rapid bit swaps without tools. The shank length is 3 1/2 inches, providing reach into recessed fastener locations. Verify that your driver accepts 1/4-inch hex shanks before purchase.

Highlights

  • 39-piece security bit set covers Torx, Hex, Phillips and specialty drives
  • Alloy steel shank with chrome vanadium molybdenum bits resists wear under high torque
  • Magnetic quick-change holder speeds bit swaps on the job
  • Cushion-grip handle reduces fatigue during extended fastening tasks
  • Compact separate case keeps 39 pieces organised and portable

Specifications

BrandWiha Tools
Model71990
TypeHex Drive Bits

Questions about this item

Which bits in the 39-piece set will wear out first and need replacing?

The smaller Torx security bits such as T8s and T10s and the 1/8 in hex bits tend to round off before the larger T40s or 8 mm bits under normal use.

What stops me from using the 1/4 in drive bits continuously on a powered driver?

The 3 1/2 in alloy-steel shank transfers high torque directly to the chrome-vanadium-molybdenum tips, so the bit tips reach their shear limit before the shank does.

Does the case or the bits get hot when the set is used all day on a drill?

The separate storage case stays cool; only the working bit warms slightly from friction, and the alloy-steel shank dissipates heat quickly without discomfort.

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