Wiha 79247 Torx Insert Bit Set 0.25 in Drive 11 Pc

Product Description

The WIHA 79247 is an 11-piece tamper-resistant Torx screwdriver insert bit set designed for use with 0.25 inch drive tools. The set covers a wide range of security Torx sizes, from T-7S through T-40S, making it a practical choice for technicians who regularly encounter tamper-resistant fasteners in HVAC equipment, electrical panels, appliances, and commercial equipment enclosures. Each bit is engineered to engage security Torx fasteners with the center pin bore, preventing use of standard drivers on restricted hardware. The full set weighs 0.28 pounds, keeping it lightweight and easy to carry in a service bag or tool kit.

This set is suited for residential and commercial service work where tamper-resistant Torx fasteners are common. HVAC technicians, electricians, appliance repair techs, and general equipment service professionals will find the range of sizes covers most tamper-resistant Torx applications encountered in the field. The 0.25 inch drive shank fits standard bit holders, extension bars, and power drivers with a quarter-inch hex chuck, making it versatile across multiple tool platforms.

Key Features

• 11-piece tamper-resistant Torx set covering T-7S, T-8S, T-9S, T-10S, T-15S, T-20S, T-25S, T-27S, T-30S, and T-40S
• 0.25 inch drive shank compatible with standard bit holders, drivers, and extension bars
• Security Torx profile with center bore engages tamper-resistant fasteners standard bits cannot drive
• Lightweight at 0.28 pounds for easy transport in a field service kit
• Broad size range reduces the need to carry multiple individual security bits

Compatibility

Designed for use with standard 0.25 inch hex drive bit holders, screwdrivers, and power drivers. Compatible with tamper-resistant Torx fasteners in sizes T-7S through T-40S as found in HVAC equipment, electrical enclosures, appliances, and commercial hardware.

Installation Notes

Security Torx bits require a matching center-pin bore to seat properly on tamper-resistant fasteners — do not attempt to use standard Torx bits on security fasteners. Ensure the drive tool is set to the appropriate torque range for the fastener size to avoid stripping. Bits should be fully seated in the holder before applying rotational force. Inspect bits periodically for wear or rounding, and replace worn bits promptly to protect fastener heads.