Bessey's Simply Unequalled, Proven Clamp Design Has Made It the Choice of Professionals Worldwide. Tradesmen Bar Clamps Are Fast Action, High Quality Sliding Arm Bar Clamps. These Clamps Feature A Patented Profiled Rail, I Beam Design That Minimizes the Flexing or Bending Common with Flat Bar Rails, Patented Non-Slip Locking Device, Zinc-Finished Drawn Rail To Prevent Black Marks From Appearing On Wood, Protective Non-Marring Pads, and a Comfortable Ergonomic Grip Handle. Made in Germany.2-1/2" Throat Depth. Available in 6”, 12” and 24".