M3 Hex Nuts Size - Thread Size: M3; Hex Height: 2.4mm; Hex Width: 5.5mm; Carbon Steel - M3 hex nuts is made of good quality Carbon Steel。 Hex Nuts - 30 pieces hex nuts Cross screw-30 pieces M3screw M3 Replacement Nuts screw kit - Widely used in home and construction, fully threaded nuts are often used in the general assembly of components, more suitable for toy electronic equipment assembly automotive repair Hexagon Nuts are intended to be used in conjunction with screws and bolts to provide secure fastenings into unthreaded holes.designed for the basic fastening requirements which are often suitable for most applications.