2 x single 18 Spinlock Dumbbell Handles with collars Made from solid; heavily chromed steel; this pair of 18 Spinlock Dumbbell Handles are highly durable. They feature deep threads for added safety; securely locking plates to the handle. A simple spin locks plates tight. For ease of use; the handles feature knurled grips for a secure hold even when your hands are sweaty. The 1 diameter handles require standard discs. Collars included. 1 year warranty.