The Starrett 166A pin vise holds workpieces up to 0.040" (1 mm) in diameter, and has an octagonal-shaped insulated handle that prevents the tool from rolling when set down and protects the user from shock. The tapered collet provides maximum clamping surface. The vise has a 1-25/32" handle length and 3" overall length (with chuck closed). The body diameter is narrower than the chuck to enable fast opening and closing of the chuck and faster rotation when working on small workpieces.

The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company, founded in 1880, is headquartered in Athol, MA.