Make sure this fits by entering your model number. BUILD ARM SIZE AND STRENGTH - Fat Gripz will help you build bigger, stronger arms. They work by wrapping around barbells, dumbbells, pull up bars and exercise machine handles and increasing their diameter TIME-TESTED METHODS, NEW SCIENCE - Science has now confirmed what athletes and bodybuilders have known for decades - that using a thicker diameter bar causes much greater muscle activation in the arms which leads to incredible size and strength gains