THE MOST EFFECTIVE NOISE & VIBRATION REDUCING MOUNT ON THE MARKET TODAY * WATCH TOP RANKED HEAVYWEIGHT BOXER BRYANT BY BY JENNINGS USING THE GS-MOUNT BELOW * http://www.youtube.com/watch?v=rqyv5I5hB5o&feature=youtu.be * DESIGNED FOR CEILING JOIST 16" ON CENTERS - 24" ON CENTER EXTENSIONS AVAILABLE * MADE IN THE USA