KS TOOLS 1/4 inch inbus bit-dopsleutel, 6 mm (911.1439)

In a busy workshop, a technician reaches for this KS TOOLS bit socket to drive a 6 mm hex fastener on an engine cover. The 1/4" square drive clicks onto a ratchet, and the chrome vanadium steel bites firmly into the screw head. No slipping, no rounding—just a clean, controlled turn. This tool turns a fiddly job into a quick one, whether you're working on a car, a bike, or industrial machinery.

Key specifications

• Drive size: 1/4 inch square
• Bit profile: Hexagon (Allen), 6 mm
• Overall length: 37 mm
• Material: Chrome vanadium steel, hardened and tempered
• Surface finish: Matt chrome-plated
• Standard: DIN 3120 / ISO 1174
• Socket outer diameter: approx. 12.5 mm
• Number of pieces: 1

Why choose it

Forged from chrome vanadium steel, this bit socket resists high torque and corrosion. The matt chrome finish not only looks professional but also protects against rust and wear. Its compact 37 mm length fits into tight spaces where a regular hex key cannot. The 1/4" square drive is compatible with standard ratchets, extension bars, and accessories, making it a versatile addition to any tool kit.

Ideal use cases

• Automotive repair and maintenance
• Bicycle assembly and adjustment
• Furniture assembly with hex fasteners
• Industrial machinery servicing
• General DIY projects requiring 6 mm hex bits

Good to know

This bit socket is designed for manual operation only—do not use it with impact wrenches. The DIN 3120 / ISO 1174 standard ensures a precise fit on 1/4" square drives. For best results, keep the socket clean and lightly lubricated. The 6 mm hex profile is a common size, making this tool a practical choice for both professionals and hobbyists.