Welcome to our StorePlease tell us first when you have any problem, we will give you the excellent carrier and solve the issue ASAP. Thank you so much.Product creation :Material : 304 Stainless steelSurface treatment : UntreatedModel : 3/16 1/8 half of 5/32 InchFunction : LockingType : Hexagonal NutProduct power : Grade 6.8Standard variety : National standardPacking Quantity : According to your choice.