The V-shaped hanging keel is also called the card keel, and the national decorative material patent number (main dragon-ZL002 63956.4; vice dragon-ZL003 34437.1). In terms of design and manufacturing, they break the form of traditional ceiling keel, and use high-quality snowboard as raw materials. They are fireproof, rustproof, and aging resistant. Each function has passed the national test (GB11981-2001), which is convenient for construction and has outstanding effects. , Widely used in modern decoration engineering.

The two side walls of the V-shaped groove are provided with anchor hooks symmetrically and orderly. The hooks can form an inch or metric combination with the auxiliary keel. The connection between the main keel and the auxiliary keel needs to be locked with an eight-centimeter screw to make it more durable and durable.