<h2>Double-Head Self-Tightening Adjustable Spanner Wrench</h2> <p>Meet the ultimate multi-size hand tool for mechanics, engineers, and DIY enthusiasts alike. This <strong>double-headed, self-tightening adjustable wrench</strong> grips fasteners automatically as you turn — no slipping, no wasted effort. Available in two size ranges (<strong>3–17 mm</strong> and <strong>8–22 mm</strong>), it tackles a wide variety of bolt and nut sizes in a single compact tool, making it ideal for automotive maintenance, machinery repair, plumbing, and general workshop use.</p> <h3>Key Features</h3> <ul> <li> <strong>Double-Ended Design</strong> — Two working heads in one tool give you broader size coverage without swapping tools.</li> <li> <strong>Self-Tightening Mechanism</strong> — Automatically adjusts and grips as torque is applied for a secure, slip-free hold.</li> <li> <strong>Chrome Vanadium Steel Construction</strong> — High-strength alloy delivers outstanding durability and resistance to wear under demanding conditions.</li> <li> <strong>Polished &amp; Plated Finish</strong> — Full-body polish and plating protect against corrosion and keep the tool looking professional for years.</li> <li> <strong>Wide Application Range</strong> — Suited for mechanical engineering, machine repair, auto repair, and other maintenance industries.</li> <li> <strong>Compact &amp; Portable</strong> — Available in three lengths (145 mm / 220 mm / 270 mm) to suit tight spaces and heavy-duty tasks alike.</li> </ul> <h3>Specifications</h3> <table> <tbody> <tr> <td><strong>Material</strong></td> <td>Chrome Vanadium Steel</td> </tr> <tr> <td><strong>Available Sizes</strong></td> <td>3–17 mm (3.5 mm thickness) | 8–22 mm (5 mm / 8 mm thickness)</td> </tr> <tr> <td><strong>Product Lengths</strong></td> <td>145 mm / 220 mm / 270 mm</td> </tr> <tr> <td><strong>Type</strong></td> <td>Double-Head Box End Wrench</td> </tr> <tr> <td><strong>Suitable For</strong></td> <td>Metal fasteners — bolts, nuts, screws of various specifications</td> </tr> <tr> <td><strong>Country of Origin</strong></td> <td>Made in China</td> </tr> </tbody> </table> <h3>What's in the Box</h3> <ul> <li>1× Double-Head Self-Tightening Multifunctional Adjustable Wrench</li> </ul> <h3>You May Also Like</h3> <p>Round out your toolkit with these related products:</p> <ul> <li><a href="/products/leather-hole-punch-tool-diy-stitching-punch-4-5-6mm">Leather Hole Punch Tool | DIY Stitching Punch 4/5/6mm</a></li> <li><a href="/products/uv-shaped-leather-groover-skiving-tool-kit-4-piece-diy">U &amp; V Leather Groover Skiving Tool Kit – 4-Piece Stainless Set</a></li> <li><a href="/products/stainless-steel-ceramic-trimming-tool-curved-skip-knife">Stainless Steel Ceramic Trimming Tool – Curved Skip Knife</a></li> </ul> <p>Learn more: <a href="https://www.osha.gov/eye-face-protection" target="_blank" rel="noopener">OSHA on eye and face protection</a></p> <h3>Frequently Asked Questions</h3> <h4>Q: What size fasteners does this adjustable wrench fit?</h4> <p>A: The wrench is available in two ranges: the 3.5 mm-thick version covers <strong>3–17 mm</strong> fasteners, while the 5 mm/8 mm-thick version covers <strong>8–22 mm</strong> fasteners. This makes it compatible with a broad range of bolts, nuts, and screws commonly found in automotive, machinery, and general maintenance applications.</p> <h4>Q: Is this wrench suitable for professional or heavy-duty use?</h4> <p>A: Yes. The wrench is made from <strong>chrome vanadium steel</strong> — the same high-strength alloy used in professional-grade hand tools — and features a polished, plated finish for corrosion resistance. It meets industrial-quality standards and is widely used in mechanical engineering, auto repair, and machine maintenance.</p> <h4>Q: How does the self-tightening mechanism work?</h4> <p>A: As you apply torque to a fastener, the wrench's self-tightening jaws automatically close around it, creating a fi