MASTRO FLEX Heavy-Duty Metric Combination Spanner Wrench Set - Drop-Forged Chrome Vanadium Steel Set with Bright Chrome Finish & Organizer Tool Roll (15-Pc / 25-Pc Options)
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The MASTRO FLEX® Professional Tools Combination Spanner Set series is engineered for automotive mechanics, industrial technicians, and maintenance professionals requiring high-torque wrenching solutions. Drop-forged from high-grade Chrome-Vanadium (Cr-V) steel and precision heat-treated according to DIN 3113 manufacturing standards, these wrenches withstand extreme rotational torque without spreading or deforming. Each spanner features a dual-head profile: an open-end jaw for rapid engagement in tight spots and a 12-point box end for high-torque fastener loosening. Finished with a fully polished bright chrome coating for superior rust resistance and easy cleanup.
Offered in two piece-count configurations to suit different jobsite requirements:
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15-Piece Set: Covers essential metric sizes 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 22, 24, and 32 mm.
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25-Piece Set: Provides full continuous metric coverage from 6 mm up to 32 mm without skips (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 30, and 32 mm).
Both sets come in a heavy-duty red wall-hanging tool roll pouch with individually labeled pockets for indexed organization, rapid size identification, and convenient transport. Made in India.
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Specifications Table
| Parameter | Technical Specification |
| Brand |
MASTRO FLEX® Professional Tools |
| Product Type |
Heavy-Duty Metric Combination Spanner / Wrench Sets |
| Manufacturing Standard |
GS Certified / DIN 3113 Standard Compliant |
| Available Set Options |
• 15-Piece Set: 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 22, 24, 32 mm • 25-Piece Set: Complete range from 6 mm to 32 mm (6–28, 30, 32 mm) |
| Material Construction |
Drop-Forged Chrome-Vanadium (Cr-V) Alloy Steel |
| Heat Treatment |
Hardened & Tempered for Maximum Torque Strength |
| Surface Finish |
High-Polish Corrosion-Resistant Bright Chrome |
| Head Configuration |
Open-End Jaw & 12-Point Box End |
| Storage Pouch |
Heavy-Duty Fabric Tool Roll Organizer with Labeled Pockets & Hanging Grommets |
| Manufacturing Origin |
Made in India |
Key Features & Standards
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Two Configuration Options: Choose between the 15-piece standard set or the complete 25-piece continuous master set (6mm to 32mm).
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DIN 3113 Quality Standard: Manufactured to meet strict DIN 3113 industrial specifications for precise jaw dimensional accuracy and high torque tolerance.
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Drop-Forged Cr-V Steel: Heat-treated alloy steel construction resists rounding, flexing, or cracking under heavy mechanical loads.
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Bright Polished Finish: Smooth chrome plating protects against corrosion, rust, and oil staining while allowing easy wipe-down cleanup.
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Heavy-Duty Tool Roll Pouch: Reinforced fabric organizer features size-marked pockets and hanging eyelets for easy shop wall hanging or compact jobsite roll-up.
⚠️ Safety Warning: Select the exact matching metric spanner size for hex fasteners to prevent slipping or corner rounding. Never use pipe extensions ("cheater bars") on wrenches to gain extra leverage, as this can overload the tool. Wear ANSI-approved eye protection during high-torque operations.