Ceiling Mount for Punching Bags for all different bag weights from 140lbs - 260lbs GAS SPRING CALIBRATED PUNCHING BAG MOUNT SILENCES NOISE COMPLETLY DESIGNED FOR CEILING JOIST 16" ON CENTERS - 24" ON CENTER EXTENSIONS AVAILABLE MADE IN THE USA CM2000 IN ACTION: http://www.youtube.com/watch?v=rqyv5I5hB5o&feature=youtu.be