PanaVise 303 Standard Head Select the 300, 305 or 380 Base and create your own versatile vise Jaws are 2.5-inch (63.5mm) wide, 0.5 (12.6mm) tall and open to 2.25 (57.1mm) Nylon jaws offer excellent electrical insulation and gentle holding power, continuous heat tolerance up to 200 F (93 C), intermittent heat to 300 F (149 C) Limited Lifetime Warranty!