We have covered plenty of awesome accessories for RE-20, SM7B, PR-40, and other microphones here in the past. In order to use your microphone in your studio like a pro, you should consider picking up a shockmount for it. These 5 shockmounts improve the quality of your work by absorbing and damping vibrations picked up from your surroundings:
Electro Voice 309 A Shockmount: a shockmount designed specifically for the legendary RE-20 microphone. It is well-built and gives you more flexibility. Not cheap though.
Heil Sound SM-2 Shockmount: designed for the PR-40 microphone. It handles vibrations very well. The PR-40 is being used by some of the most famous podcasters around.
Samson SP01 Shockmount Spider Mount: a standard shockmount for condenser microphones. It works quite well for popular microphones such as the Audio Technica AT2020.
MXL Mics MXL-90 Microphone Shock Mount: offers isolation from your microphone stand. It has a short frame and attaches to most microphone stands.
Nady SSPF-4 Spider Shockmount: a large spider shockmount with an integrated pop filter. It has 8 elastic suspension points for better isolation. The pop filter can be rotated down or removed completely.
These shockmounts handle vibrations from your microphone stand and improve the quality of your recordings. Just make sure you pick up the one that works with your specific microphone.