Durable Alloy Steel Structure: These stone lifting clamps are made of thickened alloy steel forged at high temperature, which is safe and durable and will not break even after long-term use in harsh environments. Adjustable to Fit Various Stone Sizes: Featuring multiple adjustment holes, the clamp's opening width can be easily modified to securely fit stones of different sizes, enhancing versatility and convenience for different projects. Ergonomic and High-Capacity Design: With a maximum load capacity of 770 lbs and an opening distance adjustable from 40-300 mm, the clamp's ergonomic pull ring design and high-strength castings ensure long-lasting, stable lifting operation. SECURE NON-SLIP GRIP: The contact surface of the clamp is equipped with polyurethane rubber to ensure a firm grip on the stone without causing damage, while the texture of the rubber increases friction to prevent slipping, perfect for delicate or polished stones. Wide range of uses: Ideal for factory lifting, road construction and stone transport, this lifting clamp is suitable for a variety of materials such as marble, granite, concrete slate and rectangular bricks, making it a versatile tool for multiple industries., Manufacturer: ZOCWJK