3/16 Or 4.7mm Tube - Zinc Plated Tube Nut Fitting Pack - (10) 10mmx1.0 TN24, (2) 11mmx1.5 TN26, (2) 12mmx1.0 TN27, (2) 13mmx1.5 TN30. All the sizes to plumb any car or that requires metric fittings.