- Flexible Size Design: Size: 12mm (edge to edge); Length: 18mm; Aperture: 6mm.
- High-hardness Brass Material: DROK hex nuts are made of strong and tough brass material, which own high hardness, antirust features and long lifespan.
- Wide Uses: Our couples sets can be widely used in motor of 6mm shaft to the wheel, electric car toy, robot.
- Available Screw Size: M3*6 and M4*6, please note that the package does not includes screws.
- Package Includes: 4 x Hex Coupling
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