Adjustable Dumbbells Set 28LB/40LB/52.5LB/90LB Adjustable Dumbbells Set Fast Adjust Dumbbells Pair. 12 Weights Switch in Seconds: With just one hand and in one second, effortlessly switch between 12 weight options ranging from 7 lb to 52.5 lb for each adjustable dumbbell by simply twisting the selectorized anti-slip handle.