How to Make Simple Stacking Plates for Design

I needed to figure something out for my mom because she design one wall of the house and dose not have anything to put things on to raise them in the back so I thought of these.

Make the first Cylinder radius of 7.5 cm and a height of 5 cm

now make another Cylinder with a radius of 7 cm and a height of 5 cm

Set both cylinders to 0,0,0. Now they should be inside each other.

first copy the middle and make a copy. Then move the copy out of the way. 

Select the biggest cylinder then go to compound objects and select Boolean and subtract the one in the middle. When you are done you will have a ring. 

now select the copy and set it to 0,0,0. It should fill the space perfectly.

click on the center cylinder and raise it up 1 cm

click on one of the cylinders and then go to the Boolean tool again but this time you will want to union them together. and now you have a 3D model of simple stacking blocks.