Nauticam TN1116-Z Zoom Gear for the Tokina 11-16mm F2.8 IF DX AT-X Lens

Zoom Gear for Tokina AT-X Pro 11-16mm F2.8 (IF) DX lens
The zoom gear use on following port:
a) use together with extension ring 30 and 8.5′ dome port
b) use together with extension ring 70 and 6′ dome port
c) use together with extension ring 20 and 8.5′ white balance port
d) use together with extension ring 30 and 8.5′ white balance port

Dimension: 102mm*75mm * 15mm
Weight: 45g / 6g
Construction: Hard anodized aluminum alloy and Nylon