The TW28A-STC is just one of the many accessories available for the BESSEY welding table clamps. This versatile adapter makes it possible to use many of the BESSEY STC series toggle clamps on your 28 mm matrix table. Many other accessories are available, such as V-blocks, variable risers and an adapter that allows you to clamp horizontally as well as being able to tilt up and down by as much as 52°. BESSEY. Simply better.