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This is a mountain-type nut (also known as wing nut or butterfly nut), a fastening accessory used in conjunction with building formwork and through-wall screws.

Material: Usually made of ductile iron or carbon steel, with a galvanized surface for rust and corrosion resistance.

Structure: The main body is a hexagonal column with internal threads, with symmetrical wing-shaped handles extending from both sides and a flange at the bottom for easy manual or tool tightening.

Application: Mainly used in construction to cooperate with water-stop screws and through-wall screws to fix formwork, adjust formwork spacing, and ensure structural stability during concrete pouring.

The mountain-shaped nut (also commonly known as the mountain-shaped bolt nut, through-wall bolt nut, or trapezoidal thread nut) is a specialized nut used in construction with through-wall bolts and tie rods. It is named for its side profile resembling the Chinese character "山" (mountain). Its main uses include:

- Fixing formwork, mountain-shaped clamps, and steel pipe back braces in conjunction with through-wall bolts (tie rods).

- Locking formwork to prevent bulging or displacement during concrete pouring.

- Commonly used for reinforcing formwork in shear walls, columns, and basement walls. Common materials: ductile iron, cast steel, 45# steel.

- High strength, impact resistance, and not prone to cracking.

- Surface treatments: natural color, blackening, electro-galvanizing, etc. Available in sizes: M12, M14, M16, M18, M20, M22.

- The thread form is mainly trapezoidal, providing deep engagement, strong load-bearing capacity, and resistance to thread slippage.