Check the listing for details. 12AN Hose Firewall Pass Through -Eliminates need of gromet in fire wall -12AN. Condition: New. Listed at 48.97 USD. This is made by WCM in the USA!!!Beware i have seen chinese knock offs that look just like our product and are sold via a usa seller. This is the only place on e-bay we sell this product. The rest is a cheap copy.Up for auction we have a Firewall Passthrough and stainless steel hardware. It is CNC machined out of 6061 billet aluminum. It offers (2) holes slightly bigger then 1 inch. The hoses shown in the pictures are -12AN and are not included in the auction. I think this would also look just fine with -10AN then you would have 1/16" more space all the way around.The outside dimensions are 3.78" by 2 1/8". This is raw aluminum, it can be coated or anodized or left as is. This is a 2 piece design, the upper and lower half bolt together with the center bolts then the 4 remaining bolts bolt the bracket to the car. You can remove the top half of the bracket which allows you plenty of room to install or remove wiring then you simply bolt it back together then reinstall the car mount bolts. This will not fit any car, fabrication is required. You need to drill or saw two 1 1/4" holes at a spacing of 1 5/8" then connect the holes via saw to create an oval. Then deburr the firewall, center this bracket in the hole and mark the holes. Then simply drill the four 1/4" holes and install your sweet bracket via supplied bolts. I included a sticker with the spacing (see pic),so simply stick it on and follow the lines. Auction includes everything shown in pics except for the hoses, hose are for reference only. (TIP: if your firewall is clean or new paint stick the sticker on a rag or shop clothes first to knock down the sticking effect so it comes off clean)