This bracket moves the Wanhao Duplicator i3 drag chain to the rear 20mm and down 1mm. This solves a number of issues: 1) Front clearance so wires don't rub against the the filament 2) the drag chain rubbing/catching the X-axis limit switch 3) holds in wires as you reach the top of the Z-axis 4) Cosmetically it cleans up the look.
I've tested Z-height clearance and I still can get to the full 180mm with it installed.
It's a little tricky to install but not super hard. Its easiest if you have a ball-end hex wrench. First attached the drag chain with the original 3mm flat top screws to the bracket and add lock nuts to them. Then use 3mm x 5mm cap screws to attach the bracket to the printer.