Stainless Steel Square Nut with chamfer on the edge of head , internal machine fine threads , it is screwed into bolt or machine screws to stop them to back-out or slip-out , Regarding Feature 1. High Tensile and strength . 2. Perfect resistance rust and corrosion 3. Longevity service , 4. Bright surface , 5. Easy to operation and installation Installation attention 1. Do not hit or scratch nut for keeping bright surface 2. Check threads of nut if have any burr or fritter amonst threads , 3. Screw nut into threaded bar vertically and properly by hand . 4. You can use a plastic or nylon cap for nut to make nut keep more longevity service . ( please find non-metal fittings colum for plastic or nylon cap ) Material : Steel steel Size : M8 Finish : Polish Salty Sprey : Over 72 hours |