Wiha 42104 Screwdriver Bit Set

The Wiha 42104 screwdriver bit set contains five 29 mm long hex (imperial) bits with a 1/4" shank, designed for precision work and durable performance across a range of fastening tasks. The set is lightweight (57 g) and follows Wiha's universal TY bit concept that simplifies bit selection by focusing on screw shape rather than appliance or fastening type.

Advantages

The TY-design bits are compatible with both T-shaped and Y-shaped screws, reducing the need to choose between multiple specialized bits. A patented torsion zone makes these bits suitable for use with power tools and impact screwdrivers while providing a significantly extended service life — up to 120 times longer than Wiha standard bits. The bits feature a fluorescent coating that makes them easier to locate, including under UV light, which reduces loss and replacement costs.

Suitable for

Key specifications

How to use

Select the appropriate TY-compatible hex bit from the set and insert it into a 1/4" bit holder or quick-change chuck. For manual screwdriving, apply steady, aligned force to avoid cam-out. When using power tools or impact drivers, ensure the bit is fully seated and use the tool at recommended torque settings. After use, store the bits in a dry place; the fluorescent coating aids identification under normal or UV light.

Recommendations

Use the patented torsion zone feature when working with impact drivers to reduce stress on the bit and extend life. Avoid using damaged bits and replace any bit showing excessive wear to maintain screw and joint integrity.