The files include a parameterizable OpenSCAD source file which allows to define the desired tube diameter as well as most of the other sizes. The two STL files are examples showing a small version designed for 2mm screws to connect the top-plate and a slightly larger version which should fit 250 sized copters. Both are for 8mm tubes. The SCAD file allows to configure a screw-pattern for mounting the motor. It requires a screw diameter, two diagonal distances between opposing screws (default: 16mm and 19mm, see example STL) and an rotational angle (defaulting to 0 but being 45 degrees in the example).