The TW28AV is just one of the many accessories available for BESSEY welding table clamps. It is a pivoting spindle that not only gives you clamping in the horizontal plane but 104 degrees of adjustment. The stepless adjustment allows you to set any angle between -52 degrees to +52 degrees. An easy to use hand knob allows you to lock the spindle at the required angle. Spindle has over 6-1/2 inches of travel. BESSEY. Simply better.