Core Blaster Double Row HandleTo fully work the core requires various movements from a wide variety of angles. The Core Blaster Double Row Handle provides one more option for rotational and rowing work. Give this a try. Change up your routine and destroy any weak links you may have in your body. Slides onto the end of a barbell. This attachment is designed to be used with any of the core blasters: Signature Core Blaster Two Tone Paint Core Blaster Core Blaster: Econo Core Blaster