This is a mount for installing an auto bed leveling 18 mm probe sensor on a CR-10.
It mounts in place of the stock metal cage, so it doesn't fit on a stock CR-10.
It works great in combination with junaling's hanging fan/part cooler: https://www.thingiverse.com/thing:2473423
It uses the two M3 screws from the stock metal cage and the two smaller M2 screws from the stock part cooling fan.
The offsets are -44 mm on the X axis and -2 mm on the Y axis.
Also don't forget to enable Z_SAFE_HOMING so the Z won't try to home with the sensor outside the bed.