Ergonomic design: Ergonomic pull ring design, non-slip and wear-resistant, comfortable to use. Polyurethane rubber: special material does not damage the stone, the texture design increases friction, and the stone is not easy to slip High-quality screw accessories: Select first-class hardware accessories screws, durable, non-slip, more convenient and safer Alloy steel forging: using high-grade alloy steel, high-temperature forging processing, safe and long life Lifting clamp: chain length adjuster, more convenient to use, Manufacturer: ZOCWJK