The Cast Iron Adjustable Spinlock Dumbbell Set is a 1” Standard Plate and Set. This set features the ability to build you own dumbbells with 14” dumbbell handles and several options of weight plates. Change and secure your plates with the easy to use spin lock collars. Save time, space, and money with this easy to use spinlock set. This is a great set for those who are new to weightlifting or for those who want to have versatility without a lot of equipment.