In general, the height of the nominal diameter is more than 100 % of the height is called a high nut. Used for joint bolts and bolts, height adjustment, etc. The screw size on both sides is different, so it can be used for conversion purposes. One side W3/8, one side W1/2, total length 1.6 inches (40 mm), two side width 0.7 inches (17 mm)