Wiha 72539 Square Drive Insert Bit 25mm No. 3 30 Pack

Product Description

The WIHA 72539 is a No. 3 square drive screwdriver insert bit designed for use with power tools, impact drivers, and bit holders that accept standard hex shanks. Built from steel, this insert bit measures 25 mm in overall length and fits the hex drive format common across professional-grade screwdriving tools. The No. 3 point size is suited for larger square-drive fasteners found in heavy-duty construction, decking, and structural assembly work. This listing covers a pack of 30 bits, making it well suited for job site restocking and high-volume fastening applications where bit wear is a routine factor.

Square drive insert bits in the No. 3 size are commonly used in residential and commercial construction, cabinet installation, and rough carpentry. The 25 mm overall length is the industry-standard insert format, compatible with magnetic bit holders, quick-change extensions, and most cordless drill and impact driver chucks. Electricians, carpenters, and general contractors working with Robertson-head fasteners will find this pack practical for sustained production work.

Key Features

• No. 3 square drive point for larger Robertson-head fasteners
• 25 mm overall length fits standard hex bit holders and extensions
• Steel construction for durability under repeated torque loading
• Hex drive shank for use with power tools and manual bit holders
• 30-piece pack supports job site stocking and volume fastening tasks

Compatibility

Designed as a standard 25 mm hex-shank insert bit compatible with power drills, impact drivers, and bit holders accepting the industry-standard insert bit format.

Installation Notes

Insert bits should be seated fully into the bit holder or magnetic sleeve before driving to prevent cam-out and premature wear. Ensure the driver and fastener point sizes match before applying torque. Bits used with impact drivers are subject to higher stress cycles and should be inspected regularly and replaced when tip wear is visible.