The lay in lug is 0.38” wide and 1.13” long and is used to lay copper wires from #4AWG to #14 AWG. It is made from 99.99% copper and has a serration at the end. The screw used to fix the wire is made from Stainless Steel. It is easy to use and quick to install.It is suitable for aluminum as well as copper conductors and finds great use in laying wires on a solar panel.