Set of four tool steel collets grip firmly when screw chuck is tightened. Chromium-plated handles are hollow to permit holding of long wires. Body is stepped, with the small portion knurled, sot that it can be rotated between fingers. The larger portion is smooth so it can be held precisely in lathes and drill presses.Includes Pin Vices: 0 to .040", .025" to .062", .050" to .125", and .115" to .188".