These Solid Steel Urethane Coated Dumbbells feature Solid Steel Heads Precision drilled and bored to ensure close tolerance No bolts or plates Heads will not come loose or rotate Urethane Encased Embossed logo and increment treatment Encased with a durable hard shore urethane Urethane thickness ranges from 188' to 189' Handle Specifications 5 30 lbs. 32 mm diameter 35 lbs. 34 mm diameter 0.85 1 cm Diamond pattern knurl Please click here to view the other weights available for this dumbbell.