Get rid of the hassle of changing weights on your Bowflex dumbbells. These plastic cradles are home made and designed to make weight changes more convenient for your Series 2 Bowflex 552 dumbbells. Not sure what series your dumbbells are? These will work for 52.5 pound Bowflex dumbbells that have the red piece with the white Bowflex logo on it. Make sure not to slam your weights down or drop the cradle onto hard surfaces and these will last for a long time. Included is one cradle.