This 135 Series of Sash Clamps from IRWIN are suited for heavy-duty uses. Available in a range of sizes, each product can be customised with additional lengthening bars (sold separately except model TL1354). Comprised of a cast iron head and slides, bright drawn steel bars and a main screw and handle manufactured from high-grade steel. Features and Benefits Manufactured from a mixture of cast iron and high-grade steel for durability Available in a variety of sizes to suit your needs .Flat bottomed slides and heads allow you to stand the clamp with no support necessary Typical Applications Woodworking Metalworking Construction Industrial Notes Product REC5658536W (model TL1354) also comes with a lengthening bar