High-quality Materials: The jaws of our bar clamps is made of cast iron, sturdy and not easy to deform. The slide bar is constructed from 45# carbon structural steel, ensuring long-lasting and crack-proof performance Two Different Jaw Opening Sizes: Our bar clamps for woodworking are ideal for various standard-sized woods. The 12-inch length provides more adjustment space for precise positioning, and the 6-inch length can meet your different needs 600lbs Load Limit: These wood clamps for woodworking can easily handle various daily processing and assembly tasks, securely fixing to cut, join, and install wood, wood products (such as tables, chairs, cabinets), and steel materials Simple and Easy to Use: With a clear and detailed user manual, our F clamps allow for effortless operation throughout the process, making the processing efficient and time-saving Extended Rod: The extended rod design of our woodworking clamps can meet the operating range requirements of different thicknesses