Hello, These stands are compatible with speakers up to 4lbs. The Sony RS5 speakers are 5.5lbs so we do not recommend using these stands for the RS5 speakers. Thanks, Nate @ SANUS
Hello, This speaker stand set provides M5 and 1/4-20 screws for speakers. M6 screws are not provided in this kit. The larger M6 screw may not work with that bracket hole. If you have any other questions please reach out to us at info@sanus.com or call 1-800-359-5520. Thanks, SANUS Support