Wiha 75743 Screwdriver Insert Bit PL1 4mm Drive 28mm

Product Description

The WIHA 75743 is a precision screwdriver insert bit designed for PL1 (Phillips-Lobe combination) fasteners. It features a 4 mm drive and measures 28 mm in overall length, making it suited for tight-access assembly and service work where a compact, high-engagement bit is required. The 5-point contact geometry improves torque transfer and reduces cam-out compared to standard Phillips profiles. This bit is a replacement-style insert intended for use with compatible precision bit holders and powered or manual screwdrivers used by electricians, HVAC technicians, and other trade professionals working on panel fasteners, equipment covers, and small-component assemblies.

This insert bit is used in precision applications where standard-length bits are too large or impractical. Typical install scenarios include work on electrical enclosures, control panels, HVAC equipment covers, and light commercial or residential service tasks involving PL1-drive fasteners. Its compact 28 mm length allows operation in confined spaces without sacrificing drive engagement. The bit is sold individually and is designed for repeated use in professional service environments.

Key Features

• PL1 point type with 5-point contact geometry for reduced cam-out
• 4 mm drive size compatible with standard precision bit holders
• 28 mm overall length for use in confined or tight-access spaces
• Precision style for fine-tolerance fastener applications
• Single-piece packaging for easy replacement stocking

Compatibility

Designed as a replacement-style insert bit for use with 4 mm drive precision screwdriver bit holders accepting 28 mm insert bits with a PL1 point profile.

Installation Notes

Insert bits should be seated fully and securely in the bit holder before applying torque to avoid slippage or fastener damage. Confirm the driver or holder is rated for the drive size before use. Inspect the bit tip for wear before each use, as a worn PL1 profile increases the risk of cam-out and fastener head damage. No power shutoff is required for bit changes on manual drivers, but always de-energize equipment before performing any fastener work on live electrical or control panels.