Works for Single and Double Flares, Also ISO (Bubble) Flares. This set includes all the adapters and tools necessary for single and double flaring (standard and metric) plus the ISO (bubble) flare. Works on aluminum, copper and soft steel tubing. Not recommended for stainless steel. The set is packed in a plastic moulded storage case with complete instructions. Part # Description 31180 3/8\" Adapter 31370 3/16\" Adapter 31380 1/4\" Adapter 31390 5/16\" Adapter 31410 1/2\" Adapter 56220 6mm Adapter 56240 10mm Adapter 56270 4.75mm ISO Adapter 56300 6mm ISO Adapter 56330 8mm ISO Adapter 56360 10mm ISO Adapter 56430 Case only *Grey case