metal cylinder 3d model

Create a metallic stepped cylindrical part. The main cylinder has a diameter of 23 mm and a height of 21 mm. On the top center, add a threaded bolt with a diameter of 4 mm and a height of 15 mm. The top surface is flat and smooth. The bottom face is recessed into the cylinder and contains a hollow bolt nut at the center with an internal hole diameter of 8.5 mm. Inside the recessed bottom, include several evenly spaced radial ribs connecting the central hole to the inner wall. The object is vertically symmetrical