These plate holder attachments makes it easy to store your weights, and no extra floor space is required. Attach on right and left side of Power rack. Adds stability to the rack as well when loaded. Very convenient for loading and unloading the bar. Insert pin is 1", so your hole should be 1 1/8". Attach to the lowest hole for weight stability. Pair of weight holders weigh about 6 lbs.. Shipping weight listed below is for realistic shipping cost calculation only. For safety, an olympic collar should be used at the end of the plate holder to secure the weights in place (collars not included). Please note though we try to be accurate the dimensions maybe off slightly. These will fit most 2" x 2" racks but not all. We do not guarantee they will fit your power rack. If they don't you can return for product price refund but you will be liable for shipping both ways. Please be aware of this and make your decision to purchase knowing this. If your unsure as to whether this will fit you power rack or not we recommend buying such products locally so you have the option to return without shipping.