Durable material: Made of alloy steel in one piece, ensuring safety and durability for long-term use. Adjustable opening: The opening width can be easily adjusted to accommodate gemstones of different sizes. 【Rugged and Durable Lifting Clamps】Features an adjustable chain length design, making it versatile; its robust and durable structure is wear-resistant and safe to operate. 【Wide Range of Applications】Suitable for various occasions such as factories, stone processing, and road construction, meeting diverse needs. Anti-slip spindle: The spindle is made of polyurethane rubber with an anti-slip texture, which can improve friction and safety during use.