37 Degree Flaring Tool This is the tool you need to make ONLY 37° flares required for AN fittings. This tool will NOT make 45° flares for standard brake and fuel lines which are not compatible with AN hardware. This tool makes a clean, accurate 37° flare every time. Simple and easy to use. Necessary for making ONLY 37° flares for AN fittings. Will NOT make 45° flares for standard brake and fuel lines that are NOT compatible with AN hardware. Makes a clean, accurate flare every time. Simple and easy to use. Works on tubing from 3/16″ to 5/8″ Not recommended for use on stainless steel. This item is replacement for sku# 91089529.