An improved joint designed so the tension can be adjusted. The legs are made from a high-grade steel. Tension does not change with opening and closing of legs

An improved joint designed so the tension can be adjusted. The legs are made from a high-grade steel. Tension does not change with opening and closing of legs

Legs are made from flat stock. Strong flexible bow spring. Fulcrum stud is hardened and has a smooth bearing surface. High-grade steel construction. Quick-adjusting automatic-closing spring nut

Legs are made from flat stock. Strong flexible bow spring. Fulcrum stud is hardened and has a smooth bearing surface. High-grade steel construction. Quick-adjusting automatic-closing spring nut

Knife-edge contacts for both inside and outside measurements. One hand use with the thumb-operated fine adjustment roll. Lock screw for dial bezel. Lock screw for holding the sliding jaw in position. Positive split-gear anti-backlash control. Rack teeth point down to make it easy to shed foreign matter and thereby keep the area clean