A simple yet rugged tool, the 3rd Hand was designed to hold round or square tubing in place during the welding process. Originally used for aircraft engine mount and air frame fabrication work, it has many other applications. This steel fixture is infinitely adjustable due to its full swiveling clamp. Each model comes with 3 different length arms (3", 5" and 7"). Hose clamps are not provided. Model 3 is for flat sheets and plates and is demonstrated in the drawings below.