Welding Table Clamp Extension Compatible Table Hole Size 1 1/8 in Compatible With TW28A-STC/TW28VAD/TWVAD Toggle Clamp Adapter Features 5/8 to 11-13/16 in Adjusting Range Lowering of Round Workpieces is Infinitely Adjustable Using the Adjusting Ring in the Round Plate Holding Capacity 6 500 lb Outside Diameter 1.1 in Overall Depth 16.9 in Overall Height 16.9 in Overall Width 1.7 in Product Type Welding Table Clamp Extension Thread Size 1-1/8 In.