HAMMER STRENGTH DUMBBELLS Hammer Strength premium dumbbells offer superior durability with dual or triple lock, securely fastened head-to-handle system. Anti-roll heads, compact design and hard chrome plated handles make them easy to use and control. Hammer Strength Urethane Dumbbells: High-grade urethane gives superior resistance to scratches, cuts, abrasion, and general wear and tear over time Triple lock, securely fastened head-to-handle system Weights: 2kg – 60kg (2kg increments) Hammer Strength Rubber Dumbbells: Durable, chemically bonded rubber Dual lock, securely fastened head-to-handle system Weights: 2.5kg – 50kg (2.5kg increments)