This is a great set to have for multipurpose threadcutting and cleaning / repair etc.The tools are titanium nitride coated for extra toughness and suit the most popular applications.The die nut form allows the use of a standard open or ring spanner for use in awkward places.Handy for finishing a bolt or screw held in the lathe. Good range of sizes. the kit is presented ina strong metal carry case to keep the tools safe. Good kit for garage mechanics as well as the toolroomor general workshop including DIY as well. very pleased with this.