Bessey Tools 2.5 in. x 36 in. Tradesmen Clam was introduced in 1936 as the BESSEY malleable cast iron bar clamp, known as the world's first sliding arm clamp. While clamps with traditional wood handles remain popular, many models now feature "2K" composite handles or "tommy bar" sliding pin handles for enhanced usability. These clamps often include snap-on pressure pads that are easily replaceable, allowing for quick of damaged spindles and ensuring long-lasting performance. Model Number: