Weird rendered lighting, probably bad topology This is one of my first models, an adjustable wrench. Both Eevee and Cycles produce similar results, which look kinda weird. Adding bevels around the wormscrew hole helped a bit, but now I'm stuck.
It looks like to me you applied smooth shading to the object, but haven't turned on auto-smooth.
Try going into the Properties window -&gt; Object data properties -&gt; Normals -&gt; and check Auto Smooth.
Then fiddle around with the degree slider until all your curved surfaces are smooth, but the flat areas don't have this lighting error. I think the default 30° should work fine in this case.