The plating of common nut products is 1 to 2 coats Even the nuts used by automobile manufacturers have a 2-3 layer coating. The thickness of the plating layer greatly affects the quality and durability of the nuts. It is a very important and cost effective part of the nut. Auto-Ace non-marking nut is coated with 4 layers of plating The plating layer is about 2.5 times thicker than other nut products! Four coats are the best of plating. Extreme quality and durability. The high quality of this product is so easy to see that it will not go back after you use it. Nuts for Days and Days Luks. OEM light vehicles such as Moko,Luks,etc and Nissan regular cars cannot be installed due to the nut is different. Taper Seat Taper Angle: 60°; HEX (Wrench Size) 0.9 inches (21 mm); Total Height: 1.0 inches (26 mm); (B) Projection Height when mounted: 0.9 inches (22 mm); Wheel Contact Shape: Taper Seat 60°; Compatible Bolt Standards: M12 Pitch 1.5 (*B) is the height from the exposed point of the nut taper seat area to the top when the wheel attached.