Use: can be used in civil furniture, equipment, construction, electrical appliances, industrial machinery, etc. SPECIFICATION: Grade: 4.8 Thread Size: M4 x 0.7mm Edge Width: 13mm Height: 3mm Color: Silver Quantity – 25pcs Square Nuts. Advantage - Made of high-quality carbon steel, the square nuts are rust and corrosion resistant and provide long-lasting performance. Their square shape also makes it easier to grip and tight, ensuring a more secure grip than conventional nuts. Installation: when installing a square nut, screws are usually used to secure the connected wires. Use a wrench to tighten the square nut, and use a tightening tool to fix the screw in place. Note: Always wear the right protective equipment and take appropriate precautions when using power tools and machinery.