Establish a versatile quick-change workholding foundation on CNC machine vices with industrial-grade Base Jaws (master base jaws / carrier jaw plates). Engineered to mount directly onto the sliding and fixed guidance blocks of high-pressure, 5-axis, or modular machine vices, these precision-ground steel carrier plates feature standardized mounting interfaces, cross-key slot alignment, and precision grid holes. Designed to accept a wide variety of quick-change top jaws—including contour jaws, step inserts, and soft machinable jaws—they allow operators to swap top jaw profiles rapidly without disturbing the underlying vice assembly.