Stkpcd302x2651080.rar -

If you are working with CAD or 3D printing, these are the 3D model files of the piece itself.

Use WinRAR or 7-Zip . Right-click the file and select "Extract Here." STKPCD302X2651080.rar

These usually contain the visual assembly manual or exploded-view diagrams. If you are working with CAD or 3D