These thumb screw clamps completely eliminate the need to drill holes and insert cotter pins in order to hold up the tiers of your rack. The quality black plastic is tough enough to hold up over time, allowing you to rearrange your tiers whenever you like. These thumb screw clamps can be tightened by hand and adjusted easily so that you can shift you display according to your needs, changing it at will depending on the products you have in the rack. They’re sold separately from the racks to allow you to customize your own designs. It Completely eliminates need for pre-drilled holes and cotter pins to support tiers.This product is designed to fit on ¾” racks. Sold in Case of 10.Dimensions: 12"H x 12"W x 2" deep, Color: White, Placement Style: Countertop, Material: Plastic, Width: Medium-Duty Series and Tube Diameter: 1", . 85-112-W-1