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Help CenterDouble Ended Box Wrench Set 8-24mm Mirror Finish CR-V Steel With Mill Test Report
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Cangzhou Dean Safety&Special Tools Co., Ltd — your trusted manufacturer since 2001 — brings you a premium Double Ended Box Wrench Set 8-24mm Mirror Finish CR-V Steel. Each wrench is forged from high-grade chrome vanadium steel and finished with a flawless mirror polish, delivering exceptional strength, corrosion resistance, and precision. With an annual export value exceeding US$100 Million, our tools are shipped globally from major ports (Tianjin, Shanghai, Ningbo) to over a dozen markets worldwide. This set is accompanied by a Mill Test Report to confirm material quality and performance, ensuring you receive professional-grade tools for critical fastening tasks.
Every component in this set is designed for maximum durability and efficiency. The double-ended box wrench profile offers two different sizes per tool, reducing the number of wrenches needed while maintaining a secure grip on hex fasteners. The mirror finish not only provides an attractive appearance but also simplifies cleaning and resists rust even in demanding environments.
Key Features & Specifications
- Material: Forged from high-quality CR-V (Chrome Vanadium) steel – offers excellent tensile strength, toughness, and fatigue resistance.
- Finish: Mirror polished surface – reduces friction, prevents jamming, and is easy to wipe down after use.
- Size Range: 8mm to 24mm (complete metric coverage for common automotive and industrial applications).
- Double-Ended Design: Each wrench has two different size ends – e.g., 8x9mm, 10x11mm, 12x13mm, 14x15mm, 16x17mm, 18x19mm, 20x21mm, 22x23mm, 24mm (single ended for 24mm if applicable).
- Mill Test Report: Included with every set – verifies chemical composition and mechanical properties of the steel.
- Precision Machining: Broached 12-point openings provide a tight fit on hex nuts and bolts, minimizing rounding.
- Ergonomic Handle: Smooth, rounded edges for comfortable grip and reduced hand fatigue.
- Packaging: Comes in a durable storage pouch or plastic clip (custom packaging available on request).
| Size Combination (mm) | Length (approx.) | Weight (approx.) |
|---|---|---|
| 8 x 9 | 110 mm | 35 g |
| 12 x 13 | 140 mm | 65 g |
| 18 x 19 | 200 mm | 120 g |
| 24 (single) | 235 mm | 170 g |
Why choose this set for your workshop or tool kit? The mirror finish dramatically reduces the risk of surface corrosion even after prolonged exposure to moisture or chemicals. The CR-V steel stays tough under heavy torque loads, and the precise broaching ensures each fastener turns smoothly without slipping. Whether you are a professional mechanic servicing heavy machinery or a DIY enthusiast working on home repairs, this set covers nearly all standard metric fasteners from 8mm to 24mm.
Our factory in Cangzhou, China, has been producing safety and specialty tools for over two decades. With an annual export value exceeding US$100 Million, we serve clients across North America, South America, Europe, Africa, Oceania, and Asia. We ship from major ports including Tianjin, Shanghai, and Ningbo, ensuring fast and reliable logistics worldwide. Each order is backed by strict quality control – every wrench is individually inspected for hardness, finish, and dimensional accuracy before packing. The included Mill Test Report provides full traceability of the steel’s origin and properties, giving you confidence in the product’s integrity. We also offer custom branding, packaging, and size configurations to meet specific distributor requirements. Contact us today to place a bulk order or request a sample; our team is ready to support your business.
Frequently Asked Questions
1. What does “Mirror Finish” mean and why is it beneficial?
A mirror finish is achieved by polishing the wrench surface to a high gloss. This not only gives the tool an attractive appearance but also makes it easier to wipe clean, resists rust, and reduces friction when sliding into tight spaces.
2. Is this set complete? Which sizes are included?
The set typically includes 9 pieces covering 8mm to 24mm. Common combinations are: 8x9, 10x11, 12x13, 14x15, 16x17, 18x19, 20x21, 22x23, and 24mm (single ended). Exact composition can be confirmed before ordering.
3. What is a Mill Test Report and how do I get it?
A Mill Test Report (MTR) is a document from the steel mill that certifies the chemical and mechanical properties of the raw material. It is included with each set at no extra cost. You can request a hard copy or digital PDF.
4. Can these wrenches be used on rusted or stubborn bolts?
Yes, the 12-point design provides multiple engagement points which can help loosen slightly rounded or rusted fasteners. However, for heavily corroded nuts, we recommend using penetrating oil and a breaker bar in addition.
5. Are the wrenches made from a single piece of steel or welded?
Each wrench is one-piece forged from CR-V steel, then machined and polished. There are no welded joints, ensuring maximum strength and longevity.
6. Do you provide custom packaging or labeling for distributors?
Absolutely. We offer customizable packaging such as blow-molded cases, cardboard boxes, or pouch sets with your logo. MOQ and lead time can be discussed with our sales team.
7. What is the MOQ (Minimum Order Quantity) for this set?
For standard sets, we typically require 500–1000 pieces per shipment. Lower quantities may be arranged for samples or trial orders – please contact us for details.
8. How long does shipping take to my country?
We ship from Tianjin, Shanghai, or Ningbo ports. Sea freight to North America usually takes 20–30 days; to Europe 25–35 days; to Southeast Asia 10–15 days. Express courier (e.g., FedEx, DHL) is available for urgent orders with reduced transit time.
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