Cemco Dumbbells. Solid Steel Dumbbells carry a lifetime guarantee against breakage. Featuring a 32mm, HARD Chrome Handle with a Medium Knurl. Barbells are made with 30mm, HARD Chrome Bars. The handles (or Bar) are press-fit into the steel head, chamfered and welded on the face of the slug and then fully machined. This unique INVISA-WELD™ process eliminates an inside weld, thus creating a stronger more resilient design. Solid Steel Dumbbells come in 2.5 lb. increments up to 52.5 lb. and 5 lb. increments up to 150 lbs. Rubber Encased Dumbbells up to 125 lb. (SDBR Sold in sets only).