This is an adjustable Z-axis mount for the Wanhao Duplicator 4s.
It has a very tight and good fit on my printer, but it may be for slightly overextrusion.
So if there is a problem, let me know.
You may or may not need an endstop spacer for mounting the endstop. There is one for the ctc/replicator (small part in the thing):
Don't tip me. This is for free.
I have taken so much from others in my life.
Best use ABS or ASA inside the print box.