Beveled edge (or chamfer): The angle or inclination of a line or surface that meets another at any angle but 90°.
Thread : Complementary shape of a screw.
Hole : opening space which could be oblong or circular.
Plane : Flat surface
Sphere : Object which is perfectly round
Counter bore : Opening cylinder with a flat bottom
Ball bearing : A part of a machine which supports another part that turns round. A ball bearing is a type of rolling-element bearing which uses balls to maintain the separation between the moving parts of the bearing.
