This is a customizer for creating arc shaped drawer handles. If mounted vertically, the handles could be used as cabinet / cupboard handles.
The design is 3D-printer friendly: no supports are needed.
All dimension parameters, except for the tolerance parameters, are shown in the second picture. The customizer can optionally create nut holes for inserting nuts into the handle for the screws to screw into. The nut holes are visible in the vertical handle in the first picture. The customizer can create plugs for the nut holes in case you are mounting them vertically and want to hide the holes.
It can also create a smaller test piece so that you can test the sizing of the holes to make sure that the holes will be sized well for the screws and nuts.
The funky looking green handle second from the bottom wasn't directly created by the customizer; it's just a merged model of the handle above it and the handle below it.
The customizer will create 1) the handle, 2) the test piece, or 3) the nut hole plugs. To simplify viewing of this thing, the second STL has all three of these options combined into a single STL file.