I hope you have a . stl or . obj file which you would like to get converted into CAD supportive file so that other operation can be done, as like CNC machining, 3d printing, Moulding, etc. .
Basically STL is a 3d file format which are made with so may triangles. This file is only supported for 3d printing and it is not mechanical cad format friendly. The primarily scanned file is also in . stl/. obj format.
And Step file is made with clear surface and has very less faces to work with. It is also an universal file format supported by almost all of the CAD software.
Before place the order, you should give clear details about your expectation regarding the job via inbox