A model of a keyplate

a circular mechanical ring designed to connect sections of pipe, secure structural tubing, or mount components tightly to a flat surface like a floor or wall 

a durable, corrosion-resistant material used for precise alignment, spacing, and wear resistance in industrial, marine, and electronic applications 

A model of an adjustable arm.

(not completed, excused)

Gasket autodesk test

 not completed (example by colin boswell)