SAE Standard + Bubble ISO Metric Double Single Tube Brake Line Flare Flaring Kit Both Flare Styles Available in 1 Handy Kit SAE English size Standard Single and Double Flaring Tool Kit For tubing and lines Sizes 3/16", 1/4" , 5/16", 3/8", 1/2". Bubble ISO Metric sizes 4.75mm (3/16"), 6mm, 8mm, 10mm Both Metric and Standard (English) Holding Bars Holding bars\