The Zip Box Pro 4×5.65 (Clamp On Back Only) is an attachable 80mm back that allows you to put the Zip Box Pro onto lenses with any given front diameter. Simply place the Back Only on the Zip Box Pro and install the four screws.
Available in the Following Diameters:
80mm, 87mm, 95mm, 100mm, 104mm,110mm, 114mm
Weight: 99.8g (.22 lbs)
Dimensions: 152.4 x 12.7 x 127 mm (6 x 0.5 x 5 in)