Traditional cam clamps made of hardwood and steel, for years of daily use.
They're faster and easier to use than metal C-clamps, and they give strong pressure for instrument assembly. Slide the upper jaw into position and flip the offset cam lever to tighten the clamp. The jaws have protective cork lining.
Small clamp has 4-1/2" depth; the large clamp is 8-1/2" deep.
Both sizes open to 8".
Stewart-MacDonald cam clamps are crafted in the USA from sturdy maple and strong rust-resistant galvanized spring steel, for years of daily use.