<ul> <li>Front side - M42x1 female thread</li> <li>Rear side - Leica M mount</li> <li>Length - 6mm</li> </ul> <p>Made of high quality aluminium alloy.</p> <p>This adapter allows using M42 helicoids or macro rings on cameras with Leica M mount.</p> <p>WARNING: this adapter is NOT puposed for lenses. Infinity focus is NOT provided.</p> <p>We made a pattern for 6-digit code, and it is anodized to black color. If you want to encode some info, you should apply white paint to points that had to be unpained in usual situation with shiny metal adapters.</p> <p> </p>