Creality 3D® Z-axis 2.5mm Passive Block Aluminium Plate For CR-10S Pro (non-extruder-side)
This is one part of a list of parts that can be used to replicate the Creality CR10S Pro 3D printer , or simply, can be used as a replacement for the current one you have.
This part specifically is the one that is in the back of the right side plate (opposite side of extruder) that holds the nut for the z-axis leadscrew.
Note: This part only includes the plate shown in the pictures, no other parts are included.