PanaVise is a major manufacture of Vises and Work Holding Tools. PanaVise"s Tilt, Turn & Rotate technology has been applied to the product line, allowing for maximum efficiency and many different uses! All PanaVise Products are covered by a Limited Lifetime Warranty! Introducing the Panavise 353 PLATED STEEL JAWS (pair) for 301, 303, 304 and 381 w/screws, Your heavy-duty alternative! For 303 and 304 Vise Heads. Recommended for high heat, industrial environments. Designed for firmly holding heavier objects in a high heat environment. Limited Lifetime Warranty!