OK, for starters what Version of BobCAD are you using ?
Can you Zip up the .STEP file for us to have a look at.
Easiest way to get any information off the .STEP file is to :-
1) Create a new layer and name it "Wireframe"
2) Make that layer the "Active" layer, ie it has the Red check mark on it.
3) Go to "Utilities > Extract Edges > From Solid"
4) Now just box select the whole solid and right click and click OK
5) Now hide the layer with the solid on it by toggling the little Black dot on the layer
You will be left with a complete wireframe that you can use the "Measure" utility on to measure any and all lines, arcs etc.
Depending on the version of BC you have (V25 onwards) you should be able to select a hole in a solid
Regards
Rob
:rainfro: :rainfro: :rainfro: