The input cable is 2/0 and the grommets I use are intended for use to pass wiring thru the metal studs used in commercial or basement development
( instead of 2x4's). All sorts of sizes- really handy to 'finish' off ur install //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif They snap in the metal stud pre-cut holes, but they are a standard size if u use 'spade' bits to make ur holes. They just pressure fit and the little 'fingers' that hold them in place in the thin gauge metal studs- when placed in wood- the fingers cant expand if u drill ur holes the proper size- so the fingers remain inwards and HOLD ur cables from moving. They're like 10 cents each? Works great!//content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif