The STB series bar clamp offers heavy duty value; they are an economical alternative to the BESSEY high-performance 4800 series clamps. German produced classic profiled rails, hardened spindles (with 19 mm hex head) and sizes up to 36" makes this a real-world solution for heavy duty applications on a tighter budget. The STB comes with standard rail profile, crimped on swivel pad. Designed & manufactured for years of dependable service, these clamps are made in BESSEY's own German production facilities and, from steel that comes from BESSEY's own European steel mills. BESSEY created the first sliding arm clamp and to this day remains the category leader in both quality and design. BESSEY. Simply better.