Complete Metric & Standard Set: This 26 piece thread checker includes both metric and standard sizes for comprehensive nut and bolt identification, eliminating the need for additional tools. Accurate Thread Identification: clearly marked threads for consistent measurement and quick size verification, ideal for mechanical inspections and hardware maintenance. Sturdy Carbon Steel Construction: Made from good quality carbon steel for rust security, wear resistance, and long term use without deformation. Compact & Organized Storage: Comes with a dedicated case to keep all pieces neatly arranged and easily portable for workshop or crafting needs. Multi Purpose Application: Suitable for mechanical repairs, automotive assembly, mold fabrication, and general screw matching, meeting the needs of technicians and hobbyists.