High Performance Silicone Heater Hose - 10 feet - 5/8" ID (.625"|16mm) - Blue Manufactured in the US - Quality & satisfaction guaranteed .160" Wall Thickness - Nearly 3x the thickness of cheaper hose. If you don't see the wall thickness defined, don't buy it. High Temp & High Performance - This hose remains thermally stable at temperatures as low as -65F and as high as 500F SAE J20 and TMC 303B Certified - This hose conforms completely to the SAE J20 and TMC 303B standards for performance .940 OD