Alloy steel forging: We use high-quality thick alloy steel for high-temperature forging. High-temperature forging ensures safety, good toughness, and resistance to breakage, resulting in a longer service life. Suitable for various types of stone, marble, concrete slabs, hollow bricks, rectangular stone bricks, etc. Rubber anti-slip mat chuck: Made of polyurethane rubber material, the special material will not damage the stone. The anti-slip texture design increases friction, making the stone less likely to slide, improving friction and enhancing safety. Premium screw accessories: Selected high-quality hardware screws, with good elasticity, non-slip, and more convenient and safe to use; self-locking nuts are thickened and enlarged, safe, convenient, stable, sturdy and durable. Adjustable opening: The holes are adjustable to accommodate objects of different sizes. Opening sizes are 2-6 cm, 4-8 cm, and 6-12 cm, and can be freely and easily adjusted. By adjusting the distance between the holes, different sizes of stone can be easily accommodated. Load Capacity: This lifting device has load capacities of 350 kg, 390 kg, and 500 kg, making it a powerful tool for lifting operations. It can withstand various loads and is an ideal choice for rigging and construction engineering. Overloading is strictly prohibited., Manufacturer: JYBNBBE