3/16 Tube - Zinc Plated Tube Nut Fitting Pack - (10) 3/8-24 TN01, (2) 7/16-24 TN06, (2) 1/2-20 TN04, (2) 9/16-18 TN07. All the sizes to plumb any car or . These are all Plated steel fittings used for 3/16 brake line - all the correct sizes for the cylinder, brake valve, rubber hoses, wheel cylinders, calipers and any other brake component. SAE J527b DIN 74234 SAE J1290 4038 SAE J1650 GM123M ASTM A254