160516MB Extra Long Double Flat Ring Wrench Set | Cr-V

Crucial Structural Difference: 160517MB vs. 160517MUB

• Technicians must note the micro-configuration change between the two 7-piece layouts.
• The standard 160517MB includes a 12×13mm wrench, which tracks with Asian automotive manufacturing standards.
• The 160517MUB introduces the “U” Utility variation, replacing that wrench with a 13×15mm layout instead. Fastener pairings of 13mm and 15mm are heavily used on European car platforms (such as Volkswagen, Audi, BMW, and Mercedes-Benz) for alternator tensioners, engine mounts, and suspension links, making the MUB set the clear choice for Euro-specialist garages.

Material Engineering & Structural Truth

• 0° Offset Flat Profile: The completely flat design allows the wrench to lie perfectly flush against the cylinder block or chassis frame. This keeps the twisting force completely aligned with the fastener head, preventing the wrench from slipping sideways or corner-rounding under extreme pulling force.
• Drop-Forged Chrome Vanadium (Cr-V) Steel: To handle the immense leverage generated by an extra-long shank, the wrench bodies are forged from premium Cr-V alloy. Heat-treated to precise hardness parameters, the steel resists bending distortion even when a technician applies full body weight to a stubborn bolt.
• 12-Point Precision Bi-Hex Rings: The internal ring profiles feature advanced radius-corner tracking. By gripping the flat sides of the hex head instead of point-loading the sharp corners, this design safely delivers high torque without damaging expensive hardware.
• Industrial High-Luster Mirror Chrome Plating: The exterior steel is finished with a smooth mirror chrome shield. This creates a tight chemical barrier that prevents rust and oxidation while allowing grease and carbon muck to be wiped away quickly with a shop towel.