Jigs and fixtures serve as industrial tools to achieve precise and standardized production of interchangeable parts, ensuring consistency and compatibility in manufacturing operations. This study observes the improvement of the design and function of the jig. The study aims to analyze product costs and determine maximum profits and return on investment. The original Plate Jig had two problems: the absence of a marking function and limitations in holding curved-sided workpieces. This study focuses on enhancing the drilling process by introducing a marking and ruler system and redesigning the locator. These improvements will increase efficiency and ease of use for operators. The raw material must undergo the drilling and heat, cutting, polishing, and CNC Milling process to produce this product. The method of creating a Staircase Locator by undergoing a CNC Milling process that is designed using the SURFCAM Software is discussed in this paper. After the cost analysis, the profits can earn in RM176.02, and the return of investment is 68.98%. By employing 3-axis jigs, the measurement process can be significantly expedited.