Use tensorflow's .ckpt model

I used this code for training a model. I now have 3 files:

• model.ckpt-1.meta
• model.ckpt-1.index
• model.ckpt-1.data-00000-of-00001

How (with what methods) can I use these models now?

I'm not exactly sure what you mean with

How (with what methods) can I use these models now?

The model is not saved in those files but i can be restored with them.

Those*.ckpt get saved during training but do not contain your model. If you want to "use" your model you need to restore those files to it. Take a look at Tensorflow's Checkpoint and CheckpointManager. This tutorial shows a simple snipped of how to restore .ckpt files to your model.