Steel collet Is set into hollow brass handle with screw chuck. Capacity is 0 to .028″ (0 to .71mm), overall length 3-1/8″.
Different size steel collets are mounted in both ends of hollow handle. Capacity 0 to .099″ (0 to 2.5 mm), overall length 4-1/4″
Tool steel collets grip firmly when screw chuck is tightened. Chromium-plated handles are hollow to permit holding of long wires.
Has two steel chucks with spare chuck held in end of hollow brass handle. Will not roll off your bench. Capacity 0 to .079″ (0 to 2.0 mm).