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. Through nuts such as mini cab vans/trucks have an exposed bolt end. Our non-marking nuts are designed in the shape of the bag nut and do not expose the bolt tip, so they look great and prevent rust. Flat seat with washer; HEX (wrench size) 0.8 inches (21 mm); Total height 1.9 inches (47 mm); Bottom part diameter 0.5 inches (12 mm); (B) top to washer height 1.4 inches (35 mm); Flat seat washer (ring) diameter 1.2 inches (30 mm); Wheel contact shape straight; Compatible bolt standard M12 pitch 1.5 * Wheel hole diameter (A) from the nut top Height to washer (B ) ). The depth of the nut storage part of the wheel is an estimate for selecting the nut (B) size.