WETOLS is the originator of this 14-Inch Rivet Nut Tool, and all other are imitations. The mandrel of this Nutsert Tool is made from Chrome steel with heat treated 40? and the arm is made from 45 carbon steel, which protect against corrosion and resist to deformation. It is quipped with 7PCS interchangeable mandrels and 70PCS Rivet Nuts and all accessories are neatly and orderly arranged in a Sturdy BMC Case. This revet tool is come with a 12 months warranty.Do not hesitate to contact us when you encounter any issues about this hand tools.We are confident to provide you with the best product and service.