FOR 1/2 INCH OR 21MM HEX WRENCHES: Our wrench extender for 1/2 inch or 21MM hex wrenches. This wrench extender adapter is perfect for professionals. TIGHTEN AND LOOSEN AT THE SAME TIME: Designed to extend a wrench with another wrench for greater leverage. Use it on a different wrench to loosen or tighten stubborn rusty nuts and bolts, which allows for easier removal with less effort. To change the tightening or loosening position, simply place it on the other side of the wrench. STEEL CONSTRUCTION: This universal wrench extender adapter features heavy-duty construction that prevents the driver from slipping or rounding. Heat-treated steel construction makes the wrench extender strong and . wrench adapter. RUST-PROOF MATERIAL: Heat-treated steel with a to prevent rust. This universal wrench extender works well for rusted nuts and bolts. Protects against everyday and discoloration. for years of use. EXCELLENT WRENCH EXTENSION TOOL: The universal wrench extender adapter saves you effort. Great for adding leverage to stubborn nuts and bolts and into hard-to-reach areas. Colour:black Material:Metal Package Contents: 2 x wrench extensions Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.