Just one of the many accessories available for BESSEY welding table clamps. The TW28VAD is a variable angle pressure pad (VAD) attached to a short 28 mm diameter stud. It is great for supporting round stock and other odd shaped work pieces. The VAD can be removed from the short 28 mm diameter stud and attached to the TW28X variable height extension. Other available accessories are toggle clamp adapters, variable risers and an adapter that allows you to use some of the STC series toggle clamps on your matrix table. BESSEY. Simply better.