This is the Asetek Wheelbase Mount With Tilt, compatible with the Asetek Forte 18Nm Direct Drive wheelbase and the Invicta 27Nm Direct Drive wheelbase.
This Wheelbase Mount with TIlt can be attached to your sim rig in 2 different ways:
1) base mounted, so attached at the bottom onto a profile or onto an existing wheelplate;
2) side mounted, so attached at the sides like with many front mounts offered with sim rigs.
This versatility is greatly advantageous, and means this wheelmount is compatible with a wide range of some rigs.
Manufacturer description - Asetek SimSports® Bottom Mount with Tilt
The Asetek SimSports® Wheelbase Mount is a fully adjustable mounting option for your Asetek SimSports® wheelbase. This mounting option gives you a range of possible mounting options. The t-slots in the bottom of your wheelbase allows you to slide the wheelbase back and forth and easily angle your wheelbase up to 12.7 degrees with 4 screws; 2 on each side of the tilt bracket to find your desired racing position.