Ergonomic Design for Heavy-Duty Use: With a maximum load capacity of 770lbs and an adjustable opening distance from 40-300mm, these tongs combine strength with ease of use. The pull ring design and exquisite casting process ensure high strength, toughness, and stable lifting performance. Durable Alloy Steel Construction: Crafted from thickened alloy steel and subjected to high-temperature forging, these stone lifting clamps are designed for safety and durability. Resistant to breaking, they offer excellent stability and longevity, even in harsh environments. Adjustable for Various Stone Sizes: Featuring multiple adjustment holes, these clamps allow for the free modification of the opening width to accommodate different stone sizes. This versatility ensures a perfect fit for a wide range of applications, enhancing practicality and convenience. Non-Slip Rubber Chuck for Secure Grip: Equipped with polyurethane rubber on the contact surfaces, these clamps provide a secure hold on stones without causing damage. The textured rubber increases friction, preventing slippage and making them ideal for delicate or polished stone products. Versatile Applications Across Industries: Designed for use in factory hoisting, road construction, and stone transportation, these lifting clamps are suitable for a variety of materials including marble, granite, concrete slate, hollow bricks, and rectangular bricks, making them a versatile tool for professionals.