Product Material : This flare nut set is made of high hardness carbon steel , which has been heat treated and die forging to improve strength and wear resistance , non breakage , non deformation , and the surface is mirror polished , not easy to rust , easy to clean Compatibility : This flare nut set is equipped with a 3/8" standard square tenon interface for easy attachment : ratchet wrench , bolt cutters , extension bar , torque wrench , impact tool (depending on model) for flexible work and adaptation to complex working environments 2 Options : Style 1 includes 10 pieces of open end flare nut and 1 storage rack . Style 2 includes 10 pieces of open end flare nut and 1 storage rack , as well as a 3/8" ratchet wrench that fits the wrench head and can be used with the wrench head Clear Dimensions : Each wrench is equipped with a clear millimeter size marker for quick identification and efficiency . All wrenches are neatly arranged for easy viewing , preventing loss and saving time on searching , and can be installed in a toolbox , wall or workbench Features : Adopting an open hoe shaped structure , it can bypass obstacles and directly clamp the flare nut , which is not easy to slip off when disassembled and will not damage the corners of the nut , especially suitable for working in closed areas such as engine compartments , chassis , and instrument panels, Manufacturer: PATNFR