Compliant with the ISO 2380 hex standard, the 6.35mm hex drive interfaces at both ends maintain a tolerance of ±0.02mm, ensuring a gap-free engagement with bits and power tool hosts. Torque transmission loss is kept below 5%, enabling stable delivery of 15N·m torque. It supports connection with 1/4" hex bits, sockets, and other accessories, compatible with mainstream brands like Bosch and DeWALT. This makes it ideal for hard-to-reach areas such as behind dashboard panels or inside sofa frames, where conventional tools struggle to operate.

Constructed from aircraft-grade aluminum alloy or chrome-vanadium steel via one-piece molding, the aluminum version weighs only 50g for portability, while the steel variant achieves HRC52 hardness after quenching and tempering, with a 60% increase in bending resistance. It withstands over 20,000 torsion tests. The surface undergoes hard anodizing (aluminum) or nickel plating (steel), passing the 72-hour salt spray test for excellent wear and corrosion resistance in oily, humid, and other harsh environments.

Conclusion: The 1/4" hex drive extension bar excels in precision fitting, lightweight durability, and flexible reach, offering efficient solutions for confined-space tasks through standardized interfaces and diverse length options. Its optimized material and structural design make it a "space-expanding tool" for professional technicians and DIY enthusiasts alike, particularly in scenarios requiring both torque transmission and operational convenience.