Force USA MyRack Chin Up Option 4The Hammer Grip Chin Up Bar is bolted flush to the support brackets, so there is no movement and with a solid fixture it can take up to 400kg 880lbs in weight each. This particular attachment is for the Force USA MyRack ONLY. The Force USA MyRack Hammer Grip Multi Grip Chin Up bar allows for a variety of grips which then allow you to move through the following exercises: Weight Rating: 400kg 880lbs (static rating) Variations as follows: Chin ups Pull