20 Piece. 3/16" And 1/4" - Zinc Plated Tube Nut Fitting Pack - (11) 1/2-20 TN13, (5) 7/16-24 TN12, (4) 3/8-24 TN13. All The Sizes To Plumb A GM From 1999-2007 (NEW BODY STYLE FULL SIZE ) This set is designed for a 45-degree double flare. This set has everything you need to get started on plumbing new brake lines on your car or . All parts are Zinc Plated Color Correct. This set is manufactured by Inline Tube the leader in brake plumbing products. 3/16" 1/4" O.D. Tube Size, 3/8-24 7/16-24 1/2-20 SAE thread size