A square nut is a four-sided nut. Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening. They are also much less likely to become rounded-off after repeated loosening and tightening cycles. Features: Made of 304 stainless steel material, the 304 stainless steel material provides strength and offers good corrosion resistance in many environments. Square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening. Four-sided nut can be tightened easily by gripping two sides, and can be a quick gauge to measure the position of the nut. Work well in tight spaces by using needle nosed pliers, work well in blind spots using pliers or a wrench. There are 5 different sizes of square nuts that you can choose to fit your purpose. Specifications: Material: 304 stainless steel Shape: Square Color: Silver Standard: DIN557 Size and Quantity(Optional): M3 x 100pcs M4 x 100pcs M5 x 100pcs M6 x 20pcs M8 x 20pcs Package Includes: 1 set x Nuts Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store