Each has an oscillating head with a high quality steel pad built to last and provides firm gripping action on angular surfaces. This kit includes four of our most popular sizes – H402CS C-Clamp 0 - 2” Opening Capacity, H404CS C-Clamp 0 - 4” Opening Capacity, H406 CS C-Clamp 0 - 6” Opening Capacity and H408CS C-Clamp 0 - 8” Opening Capacity.