The PanaVise 203 PV Jr. Vise Head is a great tool for arts and crafts, jewelry and model making, electronics, and other small projects. The PV Jr. holds the work gently, but securely, and can be positioned exactly where the user wants it. The grooved jaws are excellent for holding small objects and are made of reinforced thermal composite plastic, which provides continuous heat tolerance to 350°F (177°C), and intermittent heat up to 450°F (204°C). The fine/coarse adjusting knob controls the jaw pressure.