Material: 304 Stainless Steel, strong and corrosion resistant, prevent bolts from being exposed and coming out providing better security and firm hold
Type: 304 stainless steel nylon lock nuts; Lock nuts are used for fastening to a bolt when mechanically joining materials together. The bolt threads into the nylon material are located at the top of the nut. The purpose of the nylon insert is to prevent backing off or loosening from vibration