• Includes 10 self-tapping thread inserts made of 303 stainless steel. • Specifications: internal thread M4 x 0.7 mm, external thread M6 x 1 mm, length of 10 mm (0.4 inches). • Effective tool for repairing damaged threads or threading errors. • Small slot design for easy screw fastening and tightening. • Wide application in aviation, automobiles, electronic communications, computers, molds, and mechanical equipment.