Package Content: 40 pieces M8 nylon insert lock nuts; Lock Nuts Size - Thread: M8; Pitch: 1.25mm; Total Height: 8mm; Hex Width: 13mm Material : Nylon insert locknut is made of 304 (A2-70) stainless steel and nylon, can be used indoors, outdoors and damp areas, providing long-term protection against rust and corrosion Convenient Storage: Metric locknuts are individually stowed by type in an easy to carry clear case. Easy to store and use,so that the lock nuts will not be lost or mixed up during use Self-Locking Nylon Insert - With a nylon insert, these lock nuts greatly reduce loosening under vibrations and torque. Wide Application: Hex lock nuts suitable for steel, wood, machinery and furniture construction. Package Content: 40 pieces M8 nylon insert lock nuts; Lock Nuts Size - Thread: M8; Pitch: 1.25mm; Total Height: 8mm; Hex Width: 13mm