Lock your plates on securely with the PowerHouse threaded collar system. Threaded collars provide that extra level of protection when doing pullover exercises compared to conventional bolt style collars The threaded collar system is also quick and easy to use. Attractive and durable, it comes in 2.5lb and 5lb. polished chrome cast iron plates that allow the lifter to increase dumbbell weight in popular 5lb increments. Chrome 14" Dumbbell handles accommodate all 1" standard plates, so you can add additional weight as your fitness level increases.