Complete SAE and Metric stud remover set offers the best professional extractors available Designed and tested to reach studs in difficult work areas. Includes: 3/8 in. drive 6mm, 8mm, 5/16 in., and 1/4 in. Includes: 1/2 in. drive 10mm, 12mm, 3/8 in., and 7/16 in. Packaged in a blow molded case with laminated instruction cards or stickers integrated into case design for handy reference of application information