PanaVise is a major manufacture of vises and work holding tools. PanaVise's Tilt, Turn and Rotate technology has been applied to the product line, allowing for maximum efficiency and many different uses! Introducing the Panavise 343 nylon jaws (pair) for 301, 303, 304 and 381 with screws, Excellent electrical insulation! Standard replacement jaws for our 303 and 304 vise heads. Type 6/6 nylon jaws for jobs requiring electrical insulation and gentle holding power. Continuous heat tolerance to 200 °F (93 °C), intermittent heat to 300 °F (149 °C). - The PanaVise 343 are replaceable smooth nylon jaws for vise heads and vise combos. The heat tolerant jaws are used for jobs that require electrical insulation and gentle holding power.