The 18P2121 is a mechanical panel component from Hammond Manufacturing. It has primary dimensions of 21.00 by 19.25 and a material thickness of 0.10. The design features four mounting holes, each with a typical diameter of 0.50. These holes are positioned with their centers typically 0.75 from the top and bottom edges and 0.88 from the side edges. This component is designed for applications requiring a precisely dimensioned mounting surface or cover plate.