I used a 3/4" x 3 ft sheath. It was used around a 0 AWG (8.25mm) starter cable that was installed very close to the catalytic converter. Magnet wire starters were double shielded so I folded the 3/4" grommet and used stainless steel zip ties to keep the folded grommet around the 0 AWG wire. + Looks like quality materials. + Good stitching. Logo (Clear logo solution - valve removed for a clean install)