Lion Roar Fitness InfiDeals Adjustable Cast Iron Dumbbells with Solid Dumbbell Handles - Perfect for Home Gym System- Building Muscle 60 pound set includes two textured solid chrome handles, four collars (8 lbs), four 5 pound plates, four 8 pound plates Collars are threaded for a secure fit to handles. Plates are made from durable cast iron TO ADD MORE WEIGHT, for LOWEST weight plates on Amazon, check ASIN # B00IHM82XA Holes on weight plates fit standard bar with diameter of 1". Dumbbell handle has 1-inch-diameter