Ord bot Z axis holder for 8mm trapezoidal lead screw

This is the Z holder for the trapezoidal lead screw.
Ebay link: http://www.ebay.com/itm/231326523532.
It comes with nut.
Marlin steps per unit: 1600
The adapter for the step motor can bought from the same seller
http://www.ebay.com/itm/331016222661