The D-ring has a D-ring and a D-ring. Here's a look at tying D-rings

The D-ring generally consists of a half ring and a cover. The material is 40Cr, and the specifications are mainly 10T, 20T, 36T, 50T, 60T and so on. The surface treatment has primary colors, galvanized and sprayed. D-rings are widely used in ships, ports, oil fields, transportation, electric power, military and other industries.