There is a switch prompt on the lock, you can open or close it according to the prompt, easy to use. Easily creates a positive lock between table leaves. As lever is turned, tension increases to tighten joint. Pull the table halves together tight to eliminate a gap.Features- Color:Color-zinc plating color. - Material: Iron.- Size: 7.20X4.70X3.40cm/2.83X1.85X1.34inch.- There is a switch prompt on the lock, you can open or close it according to the prompt, easy to use.- The Table connector can stay together tightly, no more gaps. - These connector locks solve the problem of table coming apart. - You can create a stencil to mark the drill holes, ensuring quick and easily mounted to the underside of the table.- Sturdy and durable expandable table leaf locks are great for cabinet doors, drawers, computer workstations, conference tables, dining tables, extension tables and more.Packing list: 4 x desk lockers