Cannon Curl + Fit Grips 1.75 - Arm Blaster Support Plus Thick/Fat Bar Training Cannon Curl + Fit Grips 1.75 - Arm Blaster Support Plus Thick/Fat Bar Training Combining Fit Grips and the Cannon Curl by Core Prodigy will transform your grip and arms! By increasing the diameter of the bar, you will feel a much greater muscle activation in your hands and arms. This increased muscle activation leads to bigger, faster gains in muscle size and functional strength (especially in overall arm size). We guarantee you'll feel the difference from the very first time you use them. The Cannon Curl perfectly supports your elbows and enables you to keep the correct posture during curls. Users immediately notice proper bicep isolation when curling with the Cannon Curl. Fit Grips have a 1 3/4 inch outside diameter and are 4 5/8 inches long. Inside diameter is 1 inch. They are made of high density silicone which allows years of maintenance free use. By Core Prodigy - Fitness Equipment Leader