Bessey CDS24-10WP 10-Inch Throat x 24-Inch Opening Heavy Duty Tradesmen Bar Clamp Glue resistant plastic caps - protect work surface. Large diameter pad surface - minimizes dimpling. Large wood handle, for power and comfort. Oversized acme threaded spindle - faster clamping with lesss cranking for smooth operation. Work - hardened for strength. Profiled, cold drawn steel rail. Engineered to minimize flexing common to ordinary flat railed clamps; made in Bessey's own mill for top quality; galvanized to prevent rust. Unique locking mechanism - separtate Bessey from "clutch style" clamps. Set screw is permanently molded into the sliding arm to interlock with serration on six sides of the rail. Bessey's fine quality, malleable cast jaws - corrugated for strenght; press fitted to rail - no mechanical fastener to loosen; powder coated.