Triangle Footplates are an optional accessory that can be threaded into the bottom of our1" round chrome postsfor greater stability of your freestanding wire shelving. Pre-drilled with 1/4" holes, they also allow you to anchor your unit to the floor for a fixed installation. Threaded to easily screw into Shelving Inc. brand 1"dia posts (3) 1/4" pre-drilled holes for anchoring wire shelving unit to floor 1/2" threaded bolt, 12 threads per inch Recommended for stabilizing narrow or tall solutions FREE SHIPPING.Ships Next Business Day.