<p>The gear is purposed to be installed onto front part of the lens.</p> <p>The front part of this lens slides along optical axis, so the gear has larger width - 20mm.</p> <ul> <li>Inner diameter - 143.5mm</li> <li>Outer diameter - 160mm</li> <li>Weight - 200 g</li> </ul> <p>The gear is secured with 6 set screws (installed) by means of hex key (included).</p> <p>Brand new, made of light alloy D16T, anodized and laser engraved.</p>