Adjustable Clamp 1491 C-Clamp Set, 3-Piece N/A Made in the USA or Imported Contains one each of the following: 1 inch C-Clamp (our #1410), 2 inch C-Clamp (our #1420) and 3 inch C-Clamp (our#1430) Respective opening capacities are 1 inch, 2 Inch and 3 Inch Respective throat depths are 1 inch, 1 inch and 2 Inch Respective load limits are 400 pounds, 400 pounds and 800 pounds Adjustable Clamp Co. (founded 1903) is the manufacturer of the C-Clamps and they are assembled with U.S. and foreign parts in our Chicago factory